Derivatives And Other Financial Instruments (Schedule Of Impact On Earnings From Interest Rate Swaps) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivatives And Other Financial Instruments
Recognized in interest expense	$ (2.9)	$ (4.5)	$ (5.9)	$ (9.2)
Amortization of basis adjustment for terminated interest rate swaps recognized in interest expense	(0.5)		(1.0)
Total increase (decrease) in interest expense	$ (3.4)	$ (4.5)	$ (6.9)	$ (9.2)