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INCOME TAXES (Tables)
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Unrecognized Tax Benefits The amount of unrecognized tax benefits was as follows:
 September 30,
 20212020
 ($ in millions)
Balance at beginning of year$21.3 $22.8 
Increases for prior year tax positions23.4 2.1 
Decreases for prior year tax positions(4.1)(3.5)
Increases for current year tax positions4.5 1.3 
Foreign currency translation adjustments(0.5)— 
Balance at end of period$44.6 $22.7 
Tax Returns Subject to Examination For our primary tax jurisdictions, the tax years that remain subject to examination are as follows:
Tax Years
U.S. federal income tax2017 - 2020
U.S. state income tax2012 - 2020
Canadian federal income tax2013 - 2020
Brazil2015 - 2020
Germany2015 - 2020
China2014 - 2020
The Netherlands2015 - 2020