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Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Financial Instruments    
Preferred Stock $ 30.4 $ 30.4
Long-term debt including current portion, carrying value 4,626.7 4,772.9
Long-term debt including current portion, fair value 4,911.8 5,447.3
Fair Value [Member]
   
Financial Instruments    
Preferred Stock 26.0 26.0
Carrying Amount [Member]
   
Financial Instruments    
Preferred Stock $ 30.4 $ 30.4