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Fair Value Disclosures (Fair Value Of Certain Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Medium-term notes at Fair Value $ 1,766.0 $ 1,753.0
Medium-term notes at Book Value $ 1,665.1 $ 1,659.8