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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ 2,396.7 $ 2,377.4 $ 2,453.6 $ 2,542.8 $ 2,639.0 $ 2,761.5
Foreign currency translation            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss 140.3   (72.1)      
Translation loss on derivative instruments, net of income tax benefit of $(24.7) and (34.9), respectively            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss 45.8   (81.2)      
Translation loss on long-term intercompany loans            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss 127.1   (133.3)      
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income tax benefit of $(35.5) and $(38.2), respectively            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss 109.5   (111.4)      
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $1.7 and $1.8, respectively            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss 0.4   0.7      
Accumulated other comprehensive loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ (422.3) $ (437.8) $ (397.3) $ (479.1) $ (505.8) $ (441.0)