Derivative Financial Instruments (Effect Of Fair Value Hedges On Income Statement) (Details) - Interest Expense [Member] - Fixed Rate Debt [Member] - Interest Rate Swaps [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Hedge Gain Recognized	$ 8.1	$ 12.1	$ 25.5
Hedged Item Loss Recognized	$ (8.1)	$ (12.1)	$ (25.5)