Commitments And Contingencies (Narrative) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Commitments And Contingencies [Abstract]
Rent expense for operating leases	$ 5.3	$ 5.4	$ 16.1	$ 16.1