NOTE 10. COMMITMENTS AND CONTINGENCIES For a description of our litigation and contingencies and additional information about our leases, refer to Note 16 and Note 10, respectively, in our 2019 Annual Report on Form 10-K. Warranty We generally accrue estimated warranty costs at the time of sale. In general, manufactured products are warranted against defects in material and workmanship when properly used for their intended purpose, installed correctly, and appropriately maintained. Warranty period terms depend on the nature of the product and range from 90 days up to the life of the product. The amount of the accrued warranty liability is determined based on historical information such as past experience, product failure rates or number of units repaired, estimated cost of material and labor, and, in certain instances, estimated property damage. The accrued warranty liability is reviewed on a quarterly basis and may be adjusted as additional information regarding expected warranty costs becomes known. The following is a rollforward of our accrued warranty liability ($ in millions): Balance, December 31, 2019 $ 79.0 Accruals for warranties issued during the period 38.5 Settlements made (41.6) Additions due to acquisitions 1.0 Effect of foreign currency translation (0.2) Balance, September 25, 2020 $ 76.7 Leases Operating lease cost was $19 million and $23 million for the three month periods ended September 25, 2020 and September 27, 2019, respectively. For the nine month periods ended September 25, 2020 and September 27, 2019, operating lease cost was $60 million and $61 million, respectively. During the nine-month periods ended September 25, 2020 and September 27, 2019, cash paid for operating leases included in operating cash flows was $52 million and $53 million, respectively. Right-of-use assets obtained in exchange for operating lease obligations were $45 million and $57 million during the nine month periods ended September 25, 2020 and September 27, 2019, respectively. As of September 25, 2020, we had entered into operating leases for which the lease had not yet commenced. These operating leases will commence in 2020 with lease terms between 3 and 15 years and have aggregate fixed payments of the non-cancelable lease terms of $14 million.