Goodwill and Other Intangible Assets - Table 1 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, Beginning Balance	$ 420.3	$ 407.7	$ 406.0
Goodwill, Acquisitions	1.4	12.6	0
Allocation to discontinued operations related to expected sale of hospital			(0.9)
Goodwill, Acquisition of Interest in Joint Venture Entity			2.6
Goodwill, Ending Balance	$ 421.7	$ 420.3	$ 407.7

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details

- Definition

Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

+ References+ Details