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Fair Value Disclosures (Fair Value Of Certain Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Fair value of certain debt [Line Items]    
Long-term Debt, Fair Value   $ 2,660.7
Long-term Debt $ 2,220.2 0.0
Medium-term notes at Book Value 9,068.2 $ 2,674.1
Medum and Long Term Notes [Member]    
Fair value of certain debt [Line Items]    
Long-term Debt, Fair Value 12,247.2  
Long-term Debt $ 11,288.4