Benefit Plans (Carrying Value And Fair Market Value Of The Deferred Compensation Obligation) (Details) (Company Stock Accounts [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Company Stock Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Carrying value	$ 8.3	$ 7.6
Fair market value	$ 11.6	$ 9.1