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INCOME TAXES - Operating Loss Carryforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss, Carryforwards      
Foreign net operating loss carryforwards $ 216.3    
Increase (decrease) in valuation allowance (27.7) $ 40.1 $ 31.7
Reconciliation of unrecognized tax benefits      
Balance at the beginning of the period 296.3 208.3 192.0
Increases related to prior years' tax positions 2.7 41.3 9.3
Decreases related to prior years' tax positions (76.6) (9.6) (15.7)
Increases related to current year tax positions 58.3 61.5 33.0
Settlements during the period (0.6) (1.0) (6.7)
Lapses of applicable statutes of limitation (5.8) (4.2) (3.6)
Balance at the end of the period 274.3 296.3 208.3
Cumulative interest and penalties with respect to unrecognized tax benefits 67.0 66.7 41.6
Potential interest and penalties with respect to unrecognized tax benefits (0.8) 24.5 5.7
Unrecognized tax benefits, if recognized, would impact effective tax rate 255.1 247.7 170.0
Senior Notes Due 2022 and 2023      
Operating Loss, Carryforwards      
Income tax expenses (benefit) related to foreign rate changes 1.6 $ 9.5 $ (26.2)
Capital losses      
Operating Loss, Carryforwards      
Foreign net operating loss carryforwards 5.6    
Federal      
Operating Loss, Carryforwards      
Net operating loss carryovers 20.1    
Foreign      
Operating Loss, Carryforwards      
Tax credits 33.8    
State      
Operating Loss, Carryforwards      
Net operating loss carryovers 175.4    
Tax credits $ 5.9