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Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Fair value $ 1,113.6 $ 1,050.0  
Debt and Lease Obligation 966.4 974.0  
2020 21.7    
2021 0.0    
2022 0.0    
2023 400.0    
2024 and after 550.0    
Interest Expense, Debt 42.5 $ 43.2 $ 47.2
Senior Notes Due 2024 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 400.0    
Debt Instrument, Interest Rate, Stated Percentage 4.875% 4.875%  
Fair value $ 457.7 $ 439.5  
Debt and Lease Obligation $ 397.9 $ 397.3  
Maturity date of debt Oct. 01, 2024 Oct. 01, 2024  
Senior Notes Due 2026 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 550.0    
Debt Instrument, Interest Rate, Stated Percentage 3.875% 3.875%  
Fair value $ 634.1 $ 580.0  
Debt and Lease Obligation $ 546.8 $ 546.2  
Maturity date of debt Aug. 26, 2026 Aug. 26, 2026  
Other Miscellaneous Debt [Member] [Domain]      
Debt Instrument [Line Items]      
Fair value $ 21.7 $ 30.4  
Debt and Lease Obligation $ 21.7 $ 30.4