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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits        
Defined Benefit Plan, Contributions        
Plan contributions by employer   $ 6.5 $ 6.6 $ 88.3
Expected benefits payments        
2021   35.0    
2022   37.1    
2023   37.9    
2024   39.8    
2025   40.4    
2026-2030   207.3    
Pension Benefits | United States        
Defined Benefit Plan, Contributions        
Plan contributions by employer $ 81.0 1.0 1.0  
Expected benefits payments        
2021   27.3    
2022   28.1    
2023   29.0    
2024   29.7    
2025   30.1    
2026-2030   149.7    
Pension Benefits | Foreign Plans        
Defined Benefit Plan, Contributions        
Plan contributions by employer   5.5 5.6  
Expected benefits payments        
2021   7.7    
2022   9.0    
2023   8.9    
2024   10.1    
2025   10.3    
2026-2030   57.6    
Other Foreign Statutory Plans [Member]        
Net liability        
Net liability for foreign subsidiaries with benefits under local statutory plans   $ 16.1 $ 15.1