during 2020 , we recorded charges to earnings of $ 34.5 million for withdrawal events at multiemployer pension funds to which we contribute . as we obtain updated information regarding multiemployer pension funds , the factors used in deriving our estimated withdrawal liabilities will be subject to change , which may adversely impact our reserves for withdrawal costs . fire-damage related costs . during the three months ended december 31 , 2019 , certain of our owned and operated facilities in our group 1 segment were impacted by separate fire-related events . although our business may incur fire-related damage to our leased or owned property , plant and equipment from time to time , we specifically identify in the table above fire-damage related costs of $ 7.7 million incurred during 2019 , due to its magnitude . bridgeton insurance recovery . during 2020 and 2019 , we recognized insurance recoveries of $ 10.8 million and $ 24.0 million , respectively , related to our closed bridgeton landfill in missouri , which we recognized as a reduction of remediation expenses in our cost of operations . incremental contract start-up costs - large municipal contract . although our business regularly incurs startup costs under municipal contracts , we specifically identify in the table above the startup costs with respect to an individual municipal contract ( and do not adjust for other startup costs under other contracts in 2020 or 2019 ) . we do this because of the magnitude of the costs involved with this particular municipal contract and the unusual nature for the time period in which they were incurred . during 2019 , we incurred costs of $ 0.7 million related to the implementation of this large municipal contract . these costs did not meet the capitalization criteria prescribed by accounting standards update 2014-09 , revenue from contracts with customers ( topic 606 ) and other assets and deferred costs-contracts with customers ( subtopic 340-40 ) . results of operations revenue we generate revenue by providing environmental services to our customers , including the collection and processing of recyclable materials , collection , transfer and disposal of non-hazardous solid waste , and other environmental solutions . our residential , small-container and large-container collection operations in some markets are based on long-term contracts with municipalities . certain of our municipal contracts have annual price escalation clauses that are tied to changes in an underlying base index such as a consumer price index . we generally provide small-container and large-container collection services to customers under contracts with terms up to three years . our transfer stations and landfills generate revenue from disposal or tipping fees charged to third parties . our recycling processing centers generate revenue from tipping fees charged to third parties and the sale of recycled commodities . our revenue from environmental solutions consists mainly of fees we charge for disposal of non-hazardous solid and liquid material and in-plant services , such as transportation and logistics . environmental solutions waste is generated from the by-product of oil and natural gas exploration and production activity . additionally , it is generated by the daily operations of industrial , petrochemical and refining facilities , including maintenance , plant turnarounds and capital projects . other non-core revenue consists primarily of revenue from national accounts , which represents the portion of revenue generated from nationwide or regional contracts in markets outside our operating areas where the associated material handling is subcontracted to local operators . consequently , substantially all of this revenue is offset with related subcontract costs , which are recorded in cost of operations . 35 table of contents the following table reflects our revenue by service line for the years ended december 31 , 2020 and 2019 ( in millions of dollars and as a percentage of revenue ) : replace_table_token_7_th the following table reflects changes in components of our revenue , as a percentage of total revenue , for the years ended december 31 , 2020 and 2019 : replace_table_token_8_th average yield is defined as revenue growth from the change in average price per unit of service , expressed as a percentage . core price is defined as price increases to our customers and fees , excluding fuel recovery , net of price decreases to retain customers . we also measure changes in average yield and core price as a percentage of related-business revenue , defined as total revenue excluding recycled commodities and fuel recovery fees , to determine the effectiveness of our pricing strategies . average yield as a percentage of related-business revenue was 2.8 % and 2.9 % for 2020 and 2019 , respectively . core price as a percentage of related-business revenue was 5.0 % for both 2020 and 2019. during 2020 , we experienced the following changes in our revenue as compared to 2019 : average yield increased revenue by 2.6 % due to positive pricing changes in all lines of business . the fuel recovery fee program , which mitigates our exposure to increases in fuel prices , decreased revenue by ( 0.7 ) % , primarily due to a decrease in fuel prices compared to the same period in 2019 and a decrease in the total revenue subject to the fuel recovery fees . volume decreased revenue by ( 3.1 ) % primarily due to a reduction in service levels attributable to the covid-19 36 table of contents pandemic . we experienced volume declines in our small- and large-container lines of business as a result of a reduction in the frequency of pickups or a temporary pause in service for certain of our customers . in addition , we experienced declines in special waste volumes disposed at certain of our landfills and a decrease in volumes at our transfer stations . story_separator_special_tag as a result of recent changes in u.s. tax law , the current macroeconomic environment and our ongoing efforts to streamline and maximize the efficiency of our tax footprint , we completed our restructuring plan which optimized our tax structure to better align with our overall operational footprint . this resulted in a reduction to our valuation allowance of $ 17.2 million for the year and three months ended december 31 , 2020. we have deferred tax assets related to state net operating loss carryforwards of approximately $ 99 million available as of december 31 , 2020. these state net operating loss carryforwards expire at various times between 2021 and 2040. we believe that it is more likely than not that the benefit from some of our state net operating loss carryforwards will not be realized due to limitations on these loss carryforwards in certain states . in recognition of this risk , as of december 31 , 2020 , we have provided a valuation allowance of approximately $ 44 million . reportable segments in december 2020 , our senior management began evaluating , overseeing and managing the financial performance of our operations through three operating segments . group 1 primarily consists of geographic areas located in the western united states , and group 2 primarily consists of geographic areas located in the southeastern and mid-western united states , and the eastern seaboard of the united states . our environmental solutions operating segment , which provides waste management solutions for daily operations of industrial , petrochemical and refining facilities , is aggregated with corporate entities and other as it only represents approximately 1 % of our consolidated revenue . each of our reportable segments provides integrated environmental services , including collection , transfer , recycling , and disposal services . summarized financial information concerning our reportable segments for the years ended december 31 , 2020 and 2019 is shown in the following table ( in millions of dollars and as a percentage of revenue in the case of operating margin ) : replace_table_token_13_th financial information for the year ended december 31 , 2019 reflects the transfer of our environmental solutions operating segment from group 2 to corporate entities and other . corporate entities and other include legal , tax , treasury , information technology , risk management , human resources , closed landfills , environmental solutions , and other administrative functions . national accounts revenue included in corporate entities represents the portion of revenue generated from nationwide and regional contracts in markets outside our operating areas where the associated material handling is subcontracted to local 41 table of contents operators . consequently , substantially all of this revenue is offset with related subcontract costs , which are recorded in cost of operations . significant changes in the revenue and operating margins of our reportable segments for 2020 compared to 2019 are discussed below . group 1 revenue for 2020 increased 1.1 % from 2019 primarily due to an increase in average yield in all lines of business and one additional workday during 2020. this increase was partially offset by volume declines in our small- and large-container collection , transfer station , and landfill lines of business . operating income for group 1 increased from $ 1,231.7 million for 2019 , or a 24.6 % operating margin , to $ 1,343.3 million for 2020 , or a 26.6 % operating margin . the following cost categories impacted our operating income margin : cost of operations favorably impacted operating income margin during 2020 , primarily due to a decrease in labor and related benefits , maintenance and repairs expenses , disposal fees and taxes , and fuel costs as a result of decreased service levels attributable to the covid-19 pandemic . fuel costs further decreased due to cng tax credits that were enacted in december 2019 and recognized during 2020. landfill depletion and amortization favorably impacted operating income margin during 2020 , primarily due to lower landfill disposal volumes primarily driven by decreased special waste volumes , and by favorable amortization adjustments to our asset retirement obligations during 2020 compared to the adjustments recognized in 2019. depreciation unfavorably impacted operating margin , primarily due to additional assets acquired with our acquisitions . group 2 revenue for 2020 decreased ( 3.1 ) % from 2019 due to volume declines in our collection lines of business as well as a decrease in special waste volumes in our landfill line of business . these decreases were partially offset by an increase in average yield in all lines of business , increases in construction and demolition and municipal solid waste volumes in our landfill line of business , and one additional workday during 2020. operating income for group 2 increased from $ 926.5 million for 2019 , or an 18.7 % operating margin , to $ 966.4 million for 2020 , or a 20.2 % operating margin . the following cost categories impacted our operating income margin : cost of operations favorably impacted operating income margin during 2020 , primarily due to a decrease in labor and related benefits , transfer and disposal costs , maintenance and repairs expenses and fuel costs as a result of decreased service levels attributable to the covid-19 pandemic . fuel costs further decreased due to cng tax credits that were enacted in december 2019 and recognized during 2020. landfill depletion and amortization unfavorably impacted operating income margin during 2020 , primarily due to an increase in our overall average depletion rate , and by decreased favorable amortization adjustments to our asset retirement obligations during 2020 compared to the adjustments recognized in 2019. depreciation unfavorably impacted operating income margin , primarily due to additional assets acquired with our acquisitions . corporate entities and other operating loss in our corporate entities and other segment increased from $ 371.0 million for 2019 to $ 600.6 million for 2020. during 2020 , we recorded a net loss on business divestitures and impairments of $

cash flows used in financing activities the most significant items affecting the comparison of our cash flows used in financing activities for 2020 and 2019 are summarized below : during 2020 , we issued $ 2,750.0 million of senior notes for cash proceeds , net of discounts and fees of $ 2,716.1 million . during 2019 , we issued $ 900.0 million of senior notes for cash proceeds , net of discounts and fees of $ 891.1 million . net payments of notes payable and long-term debt were $ 2,595.9 million during 2020 , compared to net payments of $ 581.4 million in 2019. for a more detailed discussion , see the financial condition section of this management 's discussion and analysis of financial condition and results of operations . during 2020 , we paid $ 99.1 million in cash premiums on the redemption of senior notes . during 2020 , we repurchased 1.2 million shares of our stock for $ 98.8 million . during 2019 , we repurchased 4.9 million shares of our stock for $ 399.4 million . in july 2020 , our board of directors approved an increase in our quarterly dividend to $ 0.425 per share . dividends paid were $ 522.5 million and $ 491.2 million for 2020 and 2019 , respectively . during 2020 and 2019 , cash paid for purchase price holdback releases and contingent purchase price related to acquisitions was $ 15.5 million and $ 17.2 million , respectively .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```cash flows used in financing activities the most significant items affecting the comparison of our cash flows used in financing activities for 2020 and 2019 are summarized below : during 2020 , we issued $ 2,750.0 million of senior notes for cash proceeds , net of discounts and fees of $ 2,716.1 million . during 2019 , we issued $ 900.0 million of senior notes for cash proceeds , net of discounts and fees of $ 891.1 million . net payments of notes payable and long-term debt were $ 2,595.9 million during 2020 , compared to net payments of $ 581.4 million in 2019. for a more detailed discussion , see the financial condition section of this management 's discussion and analysis of financial condition and results of operations . during 2020 , we paid $ 99.1 million in cash premiums on the redemption of senior notes . during 2020 , we repurchased 1.2 million shares of our stock for $ 98.8 million . during 2019 , we repurchased 4.9 million shares of our stock for $ 399.4 million . in july 2020 , our board of directors approved an increase in our quarterly dividend to $ 0.425 per share . dividends paid were $ 522.5 million and $ 491.2 million for 2020 and 2019 , respectively . during 2020 and 2019 , cash paid for purchase price holdback releases and contingent purchase price related to acquisitions was $ 15.5 million and $ 17.2 million , respectively .
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 Suspicious Activity Report : during 2020 , we recorded charges to earnings of $ 34.5 million for withdrawal events at multiemployer pension funds to which we contribute . as we obtain updated information regarding multiemployer pension funds , the factors used in deriving our estimated withdrawal liabilities will be subject to change , which may adversely impact our reserves for withdrawal costs . fire-damage related costs . during the three months ended december 31 , 2019 , certain of our owned and operated facilities in our group 1 segment were impacted by separate fire-related events . although our business may incur fire-related damage to our leased or owned property , plant and equipment from time to time , we specifically identify in the table above fire-damage related costs of $ 7.7 million incurred during 2019 , due to its magnitude . bridgeton insurance recovery . during 2020 and 2019 , we recognized insurance recoveries of $ 10.8 million and $ 24.0 million , respectively , related to our closed bridgeton landfill in missouri , which we recognized as a reduction of remediation expenses in our cost of operations . incremental contract start-up costs - large municipal contract . although our business regularly incurs startup costs under municipal contracts , we specifically identify in the table above the startup costs with respect to an individual municipal contract ( and do not adjust for other startup costs under other contracts in 2020 or 2019 ) . we do this because of the magnitude of the costs involved with this particular municipal contract and the unusual nature for the time period in which they were incurred . during 2019 , we incurred costs of $ 0.7 million related to the implementation of this large municipal contract . these costs did not meet the capitalization criteria prescribed by accounting standards update 2014-09 , revenue from contracts with customers ( topic 606 ) and other assets and deferred costs-contracts with customers ( subtopic 340-40 ) . results of operations revenue we generate revenue by providing environmental services to our customers , including the collection and processing of recyclable materials , collection , transfer and disposal of non-hazardous solid waste , and other environmental solutions . our residential , small-container and large-container collection operations in some markets are based on long-term contracts with municipalities . certain of our municipal contracts have annual price escalation clauses that are tied to changes in an underlying base index such as a consumer price index . we generally provide small-container and large-container collection services to customers under contracts with terms up to three years . our transfer stations and landfills generate revenue from disposal or tipping fees charged to third parties . our recycling processing centers generate revenue from tipping fees charged to third parties and the sale of recycled commodities . our revenue from environmental solutions consists mainly of fees we charge for disposal of non-hazardous solid and liquid material and in-plant services , such as transportation and logistics . environmental solutions waste is generated from the by-product of oil and natural gas exploration and production activity . additionally , it is generated by the daily operations of industrial , petrochemical and refining facilities , including maintenance , plant turnarounds and capital projects . other non-core revenue consists primarily of revenue from national accounts , which represents the portion of revenue generated from nationwide or regional contracts in markets outside our operating areas where the associated material handling is subcontracted to local operators . consequently , substantially all of this revenue is offset with related subcontract costs , which are recorded in cost of operations . 35 table of contents the following table reflects our revenue by service line for the years ended december 31 , 2020 and 2019 ( in millions of dollars and as a percentage of revenue ) : replace_table_token_7_th the following table reflects changes in components of our revenue , as a percentage of total revenue , for the years ended december 31 , 2020 and 2019 : replace_table_token_8_th average yield is defined as revenue growth from the change in average price per unit of service , expressed as a percentage . core price is defined as price increases to our customers and fees , excluding fuel recovery , net of price decreases to retain customers . we also measure changes in average yield and core price as a percentage of related-business revenue , defined as total revenue excluding recycled commodities and fuel recovery fees , to determine the effectiveness of our pricing strategies . average yield as a percentage of related-business revenue was 2.8 % and 2.9 % for 2020 and 2019 , respectively . core price as a percentage of related-business revenue was 5.0 % for both 2020 and 2019. during 2020 , we experienced the following changes in our revenue as compared to 2019 : average yield increased revenue by 2.6 % due to positive pricing changes in all lines of business . the fuel recovery fee program , which mitigates our exposure to increases in fuel prices , decreased revenue by ( 0.7 ) % , primarily due to a decrease in fuel prices compared to the same period in 2019 and a decrease in the total revenue subject to the fuel recovery fees . volume decreased revenue by ( 3.1 ) % primarily due to a reduction in service levels attributable to the covid-19 36 table of contents pandemic . we experienced volume declines in our small- and large-container lines of business as a result of a reduction in the frequency of pickups or a temporary pause in service for certain of our customers . in addition , we experienced declines in special waste volumes disposed at certain of our landfills and a decrease in volumes at our transfer stations . story_separator_special_tag as a result of recent changes in u.s. tax law , the current macroeconomic environment and our ongoing efforts to streamline and maximize the efficiency of our tax footprint , we completed our restructuring plan which optimized our tax structure to better align with our overall operational footprint . this resulted in a reduction to our valuation allowance of $ 17.2 million for the year and three months ended december 31 , 2020. we have deferred tax assets related to state net operating loss carryforwards of approximately $ 99 million available as of december 31 , 2020. these state net operating loss carryforwards expire at various times between 2021 and 2040. we believe that it is more likely than not that the benefit from some of our state net operating loss carryforwards will not be realized due to limitations on these loss carryforwards in certain states . in recognition of this risk , as of december 31 , 2020 , we have provided a valuation allowance of approximately $ 44 million . reportable segments in december 2020 , our senior management began evaluating , overseeing and managing the financial performance of our operations through three operating segments . group 1 primarily consists of geographic areas located in the western united states , and group 2 primarily consists of geographic areas located in the southeastern and mid-western united states , and the eastern seaboard of the united states . our environmental solutions operating segment , which provides waste management solutions for daily operations of industrial , petrochemical and refining facilities , is aggregated with corporate entities and other as it only represents approximately 1 % of our consolidated revenue . each of our reportable segments provides integrated environmental services , including collection , transfer , recycling , and disposal services . summarized financial information concerning our reportable segments for the years ended december 31 , 2020 and 2019 is shown in the following table ( in millions of dollars and as a percentage of revenue in the case of operating margin ) : replace_table_token_13_th financial information for the year ended december 31 , 2019 reflects the transfer of our environmental solutions operating segment from group 2 to corporate entities and other . corporate entities and other include legal , tax , treasury , information technology , risk management , human resources , closed landfills , environmental solutions , and other administrative functions . national accounts revenue included in corporate entities represents the portion of revenue generated from nationwide and regional contracts in markets outside our operating areas where the associated material handling is subcontracted to local 41 table of contents operators . consequently , substantially all of this revenue is offset with related subcontract costs , which are recorded in cost of operations . significant changes in the revenue and operating margins of our reportable segments for 2020 compared to 2019 are discussed below . group 1 revenue for 2020 increased 1.1 % from 2019 primarily due to an increase in average yield in all lines of business and one additional workday during 2020. this increase was partially offset by volume declines in our small- and large-container collection , transfer station , and landfill lines of business . operating income for group 1 increased from $ 1,231.7 million for 2019 , or a 24.6 % operating margin , to $ 1,343.3 million for 2020 , or a 26.6 % operating margin . the following cost categories impacted our operating income margin : cost of operations favorably impacted operating income margin during 2020 , primarily due to a decrease in labor and related benefits , maintenance and repairs expenses , disposal fees and taxes , and fuel costs as a result of decreased service levels attributable to the covid-19 pandemic . fuel costs further decreased due to cng tax credits that were enacted in december 2019 and recognized during 2020. landfill depletion and amortization favorably impacted operating income margin during 2020 , primarily due to lower landfill disposal volumes primarily driven by decreased special waste volumes , and by favorable amortization adjustments to our asset retirement obligations during 2020 compared to the adjustments recognized in 2019. depreciation unfavorably impacted operating margin , primarily due to additional assets acquired with our acquisitions . group 2 revenue for 2020 decreased ( 3.1 ) % from 2019 due to volume declines in our collection lines of business as well as a decrease in special waste volumes in our landfill line of business . these decreases were partially offset by an increase in average yield in all lines of business , increases in construction and demolition and municipal solid waste volumes in our landfill line of business , and one additional workday during 2020. operating income for group 2 increased from $ 926.5 million for 2019 , or an 18.7 % operating margin , to $ 966.4 million for 2020 , or a 20.2 % operating margin . the following cost categories impacted our operating income margin : cost of operations favorably impacted operating income margin during 2020 , primarily due to a decrease in labor and related benefits , transfer and disposal costs , maintenance and repairs expenses and fuel costs as a result of decreased service levels attributable to the covid-19 pandemic . fuel costs further decreased due to cng tax credits that were enacted in december 2019 and recognized during 2020. landfill depletion and amortization unfavorably impacted operating income margin during 2020 , primarily due to an increase in our overall average depletion rate , and by decreased favorable amortization adjustments to our asset retirement obligations during 2020 compared to the adjustments recognized in 2019. depreciation unfavorably impacted operating income margin , primarily due to additional assets acquired with our acquisitions . corporate entities and other operating loss in our corporate entities and other segment increased from $ 371.0 million for 2019 to $ 600.6 million for 2020. during 2020 , we recorded a net loss on business divestitures and impairments of $

