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Indebtedness (Components of Indebtedness) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Other long-term debt $ 9.1 $ 10.5
Debt issuance costs (1.8) (2.5)
Current portion of long term debt (315.7) (325.9)
Total long-term indebtedness, less current portion 1,206.4 1,256.7
Long-term Debt, Total 1,522.1 1,582.6
Senior term loan due 2022    
Debt Instrument [Line Items]    
Senior notes 178.1 184.0
Credit facility, expires 2023    
Debt Instrument [Line Items]    
Credit facility 260.0 277.9
1.002% Senior term loan due 2025    
Debt Instrument [Line Items]    
Senior notes 296.8 306.7
Senior term loans due between 2021 and 2028    
Debt Instrument [Line Items]    
Senior notes 779.9 806.0
Senior term loans due 2021, net of debt issuance costs    
Debt Instrument [Line Items]    
Current portion of long term debt (313.4) (323.6)
Current portion of other long-term debt    
Debt Instrument [Line Items]    
Current portion of long term debt $ (2.3) $ (2.3)