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Fair Value Disclosures (Fair Value Of Certain Short And Long-term Debt, Based On Market Prices) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Medium Term Notes at Fair Value $ 1,753.0 $ 1,803.6
Medium-term notes at Book Value $ 1,659.8 $ 1,703.9