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Derivatives and Fair Value Measurements (Details 4) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Level 1 to Level 2 transfers $ 0.0   $ 0.0
Level 2 to Level 1 transfers 0.0   $ 0.0
Carrying value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, carrying value 6,301.9 $ 5,986.8  
Estimated fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 2,126.3 $ 5,227.9