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Pension Plans and Other Benefits - Changes in Defined Benefit Obligations and Plan Assets - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in plan assets:      
Fair value at beginning of period $ 790.6    
Fair value at end of period 845.2 $ 790.6  
Amounts recognized in the consolidated balance sheets:      
Noncurrent liabilities (158.5) (173.6)  
North American Pension Plans      
Change in projected benefit obligation:      
Benefit obligation at beginning of period 755.5 673.6  
Service cost 4.2 4.8 $ 6.2
Interest cost 20.9 25.0 24.0
Actuarial loss 49.8 67.4  
Currency fluctuations 10.9 15.7  
Benefits paid (44.7) (40.6)  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0.0 9.6  
Projected benefit obligation at end of period 796.6 755.5 673.6
Change in plan assets:      
Fair value at beginning of period 790.6 701.2  
Currency fluctuations 11.0 16.8  
Actual return 82.4 107.7  
Company contribution 5.9 5.5  
Benefits paid (44.7) (40.6)  
Fair value at end of period 845.2 790.6 $ 701.2
Funded status of the plans as of the end of period 48.6 35.1  
Amounts recognized in the consolidated balance sheets:      
Noncurrent assets 59.7 45.8  
Current liabilities (0.6) (0.8)  
Noncurrent liabilities (10.5) (9.9)  
Amounts recognized in accumulated other comprehensive (income) loss      
Prior service costs 15.8 25.2  
Actuarial loss 88.7 94.8  
Accumulated benefit obligation for the defined benefit pension plans 796.1 754.7  
North American Other Postretirement Benefits Plan      
Change in projected benefit obligation:      
Benefit obligation at beginning of period 35.5    
Projected benefit obligation at end of period 35.0 35.5  
Brazil Defined Benefit Pension Plans      
Change in plan assets:      
Company contribution 0.4 $ 0.7  
Colonsay      
Amounts recognized in the consolidated balance sheets:      
Current liabilities $ (7.4)