Derivative Financial Instruments (Effect Of Cash Flow Hedges On Financial Statements) (Details) - Forward Starting Pay Fixed Swaps [Member] - Cash Flow Hedge [Member] - Interest Expense [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion Pretax Hedge Gain (Loss) Recognized in Other Comprehensive (Loss) Income	$ (75.2)	$ 0.0	$ 0.0
Effective Portion Hedge Gain (Loss) Reclassified from Accumulated Other Comprehensive Income	(5.5)	(5.0)	(4.6)
Ineffective Portion Hedge Gain (Loss) Recognized	$ 0.0	$ 0.0	$ 0.0