Derivative Financial Instruments (Effect Of Cash Flow Hedges On Financial Statements) (Details) (Forward Starting Pay Fixed Swaps [Member], Cash Flow Hedging [Member], Interest Expense [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Forward Starting Pay Fixed Swaps [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion Pretax Hedge Gain (Loss) Recognized in Other Comprehensive Loss	$ (4.0)	$ (18.2)	$ (24.0)
Effective Portion Hedge Gain (Loss) Reclassified from Accumulated Other Comprehensive Income	(4.2)	(1.8)	(1.2)
Ineffective Portion Hedge Gain (Loss) Recognized	$ (0.1)	$ 0	$ 0