Business Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012 Y
Business Acquisition [Line Items]
Number of physician group practices acquired	4
Business acquisition, total consideration	$ 32.9
Cash consideration	26.8
Contingent consideration	6.1
Goodwill recorded in connection with acquisitions	24.6
Other intangible assets	8.3
Time period for achievement of certain performance measures for payment of contingent consideration, years	5
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	6.7
Minimum [Member]
Business Acquisition [Line Items]
Assumed discount rates for acquisition-date fair value	3.00%
Maximum [Member]
Business Acquisition [Line Items]
Assumed discount rates for acquisition-date fair value	5.00%
Prior-Period Acquisitions [Member]
Business Acquisition [Line Items]
Contingent consideration payments related to prior-period acquisitions	$ 1.7

Assumed discount rates used to record accrued contingent consideration using the income approach.

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Assumed payment probability of contingent consideration payment.

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Number of physician group practices.

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Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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Amount of cash paid to acquire the entity.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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