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Financing Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 15, 2016
Mar. 31, 2017
Dec. 31, 2016
Jun. 16, 2016
Debt Instrument [Line Items]        
Long-term Debt   $ 3,262.7 $ 3,358.0  
Debt discounts, premiums and issuance costs   19.3 20.1  
Commercial Paper [Member] | US Dollar-Denominated Commercial Paper [Member]        
Debt Instrument [Line Items]        
Long-term Debt   $ 118.5 347.9  
Short-term Debt, Weighted Average Interest Rate   1.29%    
Debt Instrument, Term   7 days    
Commercial Paper [Member] | Euro Denominated Commercial Paper [Member]        
Debt Instrument [Line Items]        
Long-term Debt   $ 160.3 $ 26.8  
Short-term Debt, Weighted Average Interest Rate   (0.04%)    
Debt Instrument, Term   37 days    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Term 5 years      
Line of Credit Facility, Current Borrowing Capacity       $ 1,500.0