Commitments And Contingencies (Schedule Of Insurance Programs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingencies [Abstract]
Health insurance	$ 11.1	$ 11.0
Workers' compensation	15.6	16.1
Professional liability	3.4	3.2
Estimated insurance liability, Total	30.1	30.3
Less: long-term portion	(1.6)	(2.2)
Estimated insurance liability, Excluding long-term	$ 28.5	$ 28.1