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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, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Commercial Paper Maximum Aggregate Amount $ 1,000.0  
Commercial paper 330.0 $ 942.0
Capital Leases and Other Debt [Member]    
Debt Instrument [Line Items]    
Capital leases and other debt 139.4 $ 136.2
Secured Debt [Member] | Mortgage Facility [Member]    
Debt Instrument [Line Items]    
Balloon payment for mortgage $ 143.9  
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Short-term Debt, Weighted Average Interest Rate, at Point in Time 1.97% 1.26%
Maximum [Member] | Commercial Paper [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Term 397 days  
Weighted Average [Member] | Commercial Paper [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Term 24 days 24 days