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Fair Value Measurements Fair Value and Related Carrying Amount of Certain Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 376.1 $ 1,160.1
Checks outstanding in excess of cash balances 29.8 54.7
Long-term Debt, Gross 2,218.8 2,218.1
Long-term Debt 2,042.0 2,218.1
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 376.1 1,160.1
Checks outstanding in excess of cash balances 29.8 54.7
Long-term debt $ 1,784.6 $ 2,171.6