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Business Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Number of physician group practices acquired	7
Business acquisition, total consideration	$ 81.0
Cash consideration	72.3
Contingent consideration	8.7
Goodwill recorded in connection with acquisitions	77.2
Time period for achievement of certain performance measures for payment of contingent consideration, years	4
Assumed payment probability of contingent consideration payment	100.00%
Range of the undiscounted amount under contingent consideration agreement, low	0
Range of the undiscounted amount under contingent consideration agreement, high	9.6
Additional intangible assets	4.8
Fixed assets	0.2
Other liabilities	1.2
Prior Period Acquisitions [Member]
Contingent consideration		5.0
Goodwill recorded in connection with acquisitions	82.0
Contingent consideration payments related to prior-period acquisitions	11.3
Additional intangible assets	1.3
Fixed assets	1.0
Other liabilities	0.8
Goodwill deductible for tax purpose	$ 45.5
Maximum [Member]
Assumed discount rates for acquisition-date fair value	6.00%
Minimum [Member]
Assumed discount rates for acquisition-date fair value	3.00%

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