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Fair Value Measurements Fair Value and Related Carrying Amount of Certain Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 616.4 $ 376.1 $ 500.4 $ 1,160.1
Checks outstanding in excess of cash balances 0.0 29.8    
Long-term debt 2,192.9 2,191.5    
Reported Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 616.4 376.1    
Checks outstanding in excess of cash balances 0.0 29.8    
Long-term debt 2,192.9 2,191.5    
Estimate of Fair Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 616.4 376.1    
Checks outstanding in excess of cash balances 0.0 29.8    
Long-term debt, fair value $ 2,028.9 $ 1,784.6