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Indebtedness (Components of Indebtedness) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Jan. 25, 2019
Debt Instrument [Line Items]      
Other long-term debt $ 9.0 $ 10.5  
Debt issuance costs (1.4) (2.5)  
Total long-term debt 1,543.9 1,582.6  
Current portion of long term debt (224.8) (325.9)  
Total long-term indebtedness, less current portion 1,319.1 1,256.7  
Senior term loan due 2022      
Debt Instrument [Line Items]      
Senior notes   184.0  
Credit facility, expires 2023      
Debt Instrument [Line Items]      
Credit facility 395.0 277.9  
1.002% Senior term loan due 2025      
Debt Instrument [Line Items]      
Debt instrument, interest rate, percent     1.002%
1.002% Senior term loan due 2025      
Debt Instrument [Line Items]      
Senior notes 289.7 306.7  
Senior term loans due between 2021 and 2028      
Debt Instrument [Line Items]      
Senior notes 677.8 806.0  
Senior term loans due 2021, net of debt issuance costs      
Debt Instrument [Line Items]      
Current portion of long term debt (222.5) (323.6)  
Current portion of other long-term debt      
Debt Instrument [Line Items]      
Current portion of long term debt $ (2.3) $ (2.3)