Assets and Liabilities in and Results of Discontinued Operations - Table 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating results of discontinued operations
Net operating revenues									$ 95.7	$ 123.7	$ 144.0
Costs and expenses									67.8	108.8	136.0
Impairments									6.8	0.6	4.0
Income (loss) from discontinued operations									21.1	14.3	4.0
Gain (loss) on disposal of assets of discontinued operations									0	(1.2)	0.3
Gain on divestitures of LTCHs/divisions									65.6	0	13.4
Income tax (expense) benefit									(37.9)	(4.0)	0.7
Income from discontinued operations, net of tax	$ (5.0)	$ 34.7	$ 1.6	$ 17.5	$ 1.3	$ 3.2	$ 3.3	$ 1.3	$ 48.8	$ 9.1	$ 18.4