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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, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Commercial paper, maximum aggregate amount outstanding permitted $ 1,000.0  
Commercial paper, amount outstanding 630.0 $ 330.0
Capital Leases and Other Debt [Member]    
Debt Instrument [Line Items]    
Capital leases and other debt $ 133.1 $ 139.4
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Weighted-average annual interest rate 3.22% 1.97%
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 21 days 24 days