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Long-Term Debt and Commercial Paper (Other Long-Term Debt and Commercial Paper) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Commercial paper, maximum aggregate amount outstanding permitted $ 1,000.0  
Commercial paper, amount outstanding 0.0 $ 170.0
Other Debt [Member]    
Debt Instrument [Line Items]    
Finance Leases Included In Long-term Debt $ 116.6 $ 93.9
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Weighted-average annual interest rate   2.13%
Maximum [Member] | Commercial Paper [Member]    
Debt Instrument [Line Items]    
Maturity period of debt 397 days  
Weighted Average [Member] | Commercial Paper [Member]    
Debt Instrument [Line Items]    
Maturity period of debt   12 days