Benefit Plans (Carrying Value And Fair Market Value Of The Deferred Compensation Obligation for Company Stock Accounts) (Details) (Company Stock Accounts [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Company Stock Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Carrying value of deferred compensation obligation	$ 7.3	$ 8.3
Fair market value of deferred compensation obligation	$ 9.5	$ 11.6