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Fair Value Measurements, Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financial Instruments    
Preferred stock $ 30.4 $ 30.4
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Financial Instruments    
Preferred stock 30.4 30.4
Long-term debt including current portion 2,537.0 2,537.0
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Financial Instruments    
Preferred stock 27.6 26.0
Long-term debt including current portion $ 2,866.6 $ 2,900.8