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Derivatives and Fair Value Measurements (Details 4) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Level 1 to Level 2 transfers $ 0   $ 0
Level 2 to Level 1 transfers 0   0
Long-term debt, carrying value   6,002.4  
Carrying amount [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, carrying value 5,998.2 6,002.4  
Estimated fair value [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 6,134.3 $ 6,167.5