Net Revenue, Provision For Doubtful Accounts, Cost Of Revenue And Other (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Revenue, Provision For Doubtful Accounts, Cost Of Revenue And Other [Abstract]
Percentage discount of gross charges to uninsured self-pay patients for non-elective procedures			60.00%
General and administrative expenses for home office	$ 54.2	$ 45.0	$ 165.6	$ 121.5