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Derivatives and Fair Value Measurements (Details 4) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Carrying value
Dec. 31, 2013
Carrying value
Jun. 30, 2014
Estimated fair value
Dec. 31, 2013
Estimated fair value
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     5,994.0 6,002.4    
Long-term debt, fair value         $ 6,055.2 $ 6,167.5