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Debt (Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Maturities of Long-term Debt [Abstract]    
Total debt $ 3,953.9 $ 4,475.4
Less than 1 year 636.2  
1-3 years 2,589.1  
3-5 years 294.0  
After 5 years 434.6  
Debt Instrument [Line Items]    
Total debt $ 3,953.9 $ 4,475.4