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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders' equity $ 2,694.5 $ 2,649.9 $ 2,698.5 $ 2,847.5 $ 2,939.0 $ 2,857.6
Foreign currency translation            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders' equity (285.9)   (223.2)      
Reclassification of currency translation adjustment to income to income related to disposition of partially held equity interest            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders' equity 32.5          
Translation gain (loss) on derivative instruments, net of income taxes of $(10.9) and $(12.9), respectively            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders' equity 1.6   (4.7)      
Translation loss on long-term intercompany loans            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders' equity (130.4)   (137.2)      
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income taxes of $(23.0) and $(23.2), respectively            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders' equity (37.2)   (37.9)      
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $1.9 and $2.0 for 2019 and 2018, respectively            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders' equity 2.9   3.2      
Accumulated other comprehensive loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders' equity $ (416.5) $ (401.8) $ (399.8) $ (375.9) $ (264.1) $ (288.2)