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Fair Value - Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financial Instruments [Abstract]    
Long-Term Debt, Including Current Portion - Carrying Amount $ 1,016.3 $ 1,018.1
Long-term Debt, Including Current Portion - Fair Value $ 1,073.3 $ 1,143.7