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INCOME TAXES (Tables)
6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Unrecognized Tax Benefits The amount of unrecognized tax benefits was as follows:
 June 30,
 20212020
 ($ in millions)
Balance at beginning of year$21.3 $22.8 
Increases for prior year tax positions20.5 — 
Decreases for prior year tax positions(3.8)(1.8)
Increases for current year tax positions2.8 1.0 
Balance at end of period$40.8 $22.0 
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