approximately $ 32 million of federal tax payments were deferred and paid in 2009 as a result of the allied acquisition .the following table summarizes the activity in our gross unrecognized tax benefits for the years ended december 31: .                                                                             | 2010           | 2009             | 2008        
balance at beginning of year                                                | $ 242.2        | $ 611.9          | $ 23.2      
additions due to the allied acquisition                                     | -              | 13.3             | 582.9       
additions based on tax positions related to current year                    | 2.8            | 3.9              | 10.6        
reductions for tax positions related to the current year                    | -              | -                | -5.1 ( 5.1 )
additions for tax positions of prior years                                  | 7.5            | 5.6              | 2.0         
reductions for tax positions of prior years                                 | -7.4 ( 7.4 )   | -24.1 ( 24.1 )   | -1.3 ( 1.3 )
reductions for tax positions resulting from lapse of statute of limitations | -10.4 ( 10.4 ) | -0.5 ( 0.5 )     | -0.4 ( 0.4 )
settlements                                                                 | -11.9 ( 11.9 ) | -367.9 ( 367.9 ) | -           
balance at end of year                                                      | $ 222.8        | $ 242.2          | $ 611.9      new accounting guidance for business combinations became effective for our 2009 financial statements .this new guidance changed the treatment of acquired uncertain tax liabilities .under previous guidance , changes in acquired uncertain tax liabilities were recognized through goodwill .under the new guidance , subsequent changes in acquired unrecognized tax liabilities are recognized through the income tax provision .as of december 31 , 2010 , $ 206.5 million of the $ 222.8 million of unrecognized tax benefits related to tax positions taken by allied prior to the 2008 acquisition .included in the balance at december 31 , 2010 and 2009 are approximately $ 209.1 million and $ 217.6 million of unrecognized tax benefits ( net of the federal benefit on state issues ) that , if recognized , would affect the effective income tax rate in future periods .during 2010 , the irs concluded its examination of our 2005 and 2007 tax years .the conclusion of this examination reduced our gross unrecognized tax benefits by approximately $ 1.9 million .we also resolved various state matters during 2010 that , in the aggregate , reduced our gross unrecognized tax benefits by approximately $ 10.0 million .during 2009 , we settled our outstanding tax dispute related to allied 2019s risk management companies ( see 2013 risk management companies ) with both the department of justice ( doj ) and the internal revenue service ( irs ) .this settlement reduced our gross unrecognized tax benefits by approximately $ 299.6 million .during 2009 , we also settled with the irs , through an accounting method change , our outstanding tax dispute related to intercompany insurance premiums paid to allied 2019s captive insurance company .this settlement reduced our gross unrecognized tax benefits by approximately $ 62.6 million .in addition to these federal matters , we also resolved various state matters that , in the aggregate , reduced our gross unrecognized tax benefits during 2009 by approximately $ 5.8 million .we recognize interest and penalties as incurred within the provision for income taxes in our consolidated statements of income .related to the unrecognized tax benefits previously noted , we accrued interest of $ 19.2 million during 2010 and , in total as of december 31 , 2010 , have recognized a liability for penalties of $ 1.2 million and interest of $ 99.9 million .during 2009 , we accrued interest of $ 24.5 million and , in total at december 31 , 2009 , had recognized a liability for penalties of $ 1.5 million and interest of $ 92.3 million .during 2008 , we accrued penalties of $ 0.2 million and interest of $ 5.2 million and , in total at december 31 , 2008 , had recognized a liability for penalties of $ 88.1 million and interest of $ 180.0 million .republic services , inc .notes to consolidated financial statements , continued .
Question: what was the change in gross unrecognized tax benefits from 2009 to 2010?
Steps: subtract(222.8, 242.2)
Answer: -19.4
Question: and how much does this change represent in relation to the gross unrecognized tax benefits in 2009, in percentage?

Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.
approximately $ 32 million of federal tax payments were deferred and paid in 2009 as a result of the allied acquisition .the following table summarizes the activity in our gross unrecognized tax benefits for the years ended december 31: .                                                                             | 2010           | 2009             | 2008        
balance at beginning of year                                                | $ 242.2        | $ 611.9          | $ 23.2      
additions due to the allied acquisition                                     | -              | 13.3             | 582.9       
additions based on tax positions related to current year                    | 2.8            | 3.9              | 10.6        
reductions for tax positions related to the current year                    | -              | -                | -5.1 ( 5.1 )
additions for tax positions of prior years                                  | 7.5            | 5.6              | 2.0         
reductions for tax positions of prior years                                 | -7.4 ( 7.4 )   | -24.1 ( 24.1 )   | -1.3 ( 1.3 )
reductions for tax positions resulting from lapse of statute of limitations | -10.4 ( 10.4 ) | -0.5 ( 0.5 )     | -0.4 ( 0.4 )
settlements                                                                 | -11.9 ( 11.9 ) | -367.9 ( 367.9 ) | -           
balance at end of year                                                      | $ 222.8        | $ 242.2          | $ 611.9      new accounting guidance for business combinations became effective for our 2009 financial statements .this new guidance changed the treatment of acquired uncertain tax liabilities .under previous guidance , changes in acquired uncertain tax liabilities were recognized through goodwill .under the new guidance , subsequent changes in acquired unrecognized tax liabilities are recognized through the income tax provision .as of december 31 , 2010 , $ 206.5 million of the $ 222.8 million of unrecognized tax benefits related to tax positions taken by allied prior to the 2008 acquisition .included in the balance at december 31 , 2010 and 2009 are approximately $ 209.1 million and $ 217.6 million of unrecognized tax benefits ( net of the federal benefit on state issues ) that , if recognized , would affect the effective income tax rate in future periods .during 2010 , the irs concluded its examination of our 2005 and 2007 tax years .the conclusion of this examination reduced our gross unrecognized tax benefits by approximately $ 1.9 million .we also resolved various state matters during 2010 that , in the aggregate , reduced our gross unrecognized tax benefits by approximately $ 10.0 million .during 2009 , we settled our outstanding tax dispute related to allied 2019s risk management companies ( see 2013 risk management companies ) with both the department of justice ( doj ) and the internal revenue service ( irs ) .this settlement reduced our gross unrecognized tax benefits by approximately $ 299.6 million .during 2009 , we also settled with the irs , through an accounting method change , our outstanding tax dispute related to intercompany insurance premiums paid to allied 2019s captive insurance company .this settlement reduced our gross unrecognized tax benefits by approximately $ 62.6 million .in addition to these federal matters , we also resolved various state matters that , in the aggregate , reduced our gross unrecognized tax benefits during 2009 by approximately $ 5.8 million .we recognize interest and penalties as incurred within the provision for income taxes in our consolidated statements of income .related to the unrecognized tax benefits previously noted , we accrued interest of $ 19.2 million during 2010 and , in total as of december 31 , 2010 , have recognized a liability for penalties of $ 1.2 million and interest of $ 99.9 million .during 2009 , we accrued interest of $ 24.5 million and , in total at december 31 , 2009 , had recognized a liability for penalties of $ 1.5 million and interest of $ 92.3 million .during 2008 , we accrued penalties of $ 0.2 million and interest of $ 5.2 million and , in total at december 31 , 2008 , had recognized a liability for penalties of $ 88.1 million and interest of $ 180.0 million .republic services , inc .notes to consolidated financial statements , continued .
Question: what was the change in gross unrecognized tax benefits from 2009 to 2010?
Steps: subtract(222.8, 242.2)
Answer: -19.4
Question: and how much does this change represent in relation to the gross unrecognized tax benefits in 2009, in percentage?
