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Derivative Financial Instruments (Effect Of Cash Flow Hedges On Financial Statements) (Details) - Forward Starting Pay Fixed Swaps [Member] - Interest Expense [Member] - Cash Flow Hedging [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Effective Portion Pretax Hedge Loss Recognized in Other Comprehensive (Loss) Income $ (409.8) $ 0.0
Effective Portion Hedge Loss Reclassified from Accumulated Other Comprehensive Income (1.4) (1.4)
Ineffective Portion Hedge Loss Recognized $ 0.0 $ 0.0