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Benefit Plans and Other Postretirement Benefits, Other (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits        
Accumulated other comprehensive income (loss), before tax        
Actuarial losses, net   $ 241.2 $ 242.2  
Prior service cost   9.5 6.5  
Defined Benefit Plan, Contributions        
Plan contributions by employer   6.6 88.3 $ 22.5
Expected benefits payments        
2020   33.6    
2021   35.2    
2022   37.5    
2023   38.2    
2024   40.1    
2025-2029   205.8    
Pension Benefits | United States        
Accumulated other comprehensive income (loss), before tax        
Actuarial losses, net   164.3 178.8  
Prior service cost   8.7 5.7  
Defined Benefit Plan, Contributions        
Plan contributions by employer $ 81.0 1.0 81.7  
Expected benefits payments        
2020   26.7    
2021   27.9    
2022   28.9    
2023   29.8    
2024   30.5    
2025-2029   152.7    
Pension Benefits | Foreign.        
Accumulated other comprehensive income (loss), before tax        
Actuarial losses, net   76.9 63.4  
Prior service cost   0.8 0.8  
Defined Benefit Plan, Contributions        
Plan contributions by employer   5.6 6.6  
Expected benefits payments        
2020   6.9    
2021   7.3    
2022   8.6    
2023   8.4    
2024   9.6    
2025-2029   53.1    
Other Foreign Statutory Plans [Member] | Foreign.        
Net liability        
Net liability for foreign subsidiaries with benefits under local statutory plans   $ 15.1 $ 13.7