| **Assets and Liabilities in and Results of Discontinued Operations** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Discontinued Operations and Disposal Groups [Abstract]**           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Assets Held for Sale and Results of Discontinued Operations          | Assets and Liabilities in and Results of Discontinued Operations:The operating results of discontinued operations are as follows (in millions):  For the Year Ended December 31, 2012 2011 2010Net operating revenues$1.0 $95.7 $123.7Less: Provision for doubtful accounts— (1.5) (2.4)Net operating revenues less provision for doubtful accounts1.0 94.2 121.3Costs and expenses0.2 66.3 106.4Impairments— 6.8 0.6Income from discontinued operations0.8 21.1 14.3Gain (loss) on disposal of assets/sale of investments of discontinued operations5.0 65.6 (1.2)Income tax expense(1.3) (37.9) (4.0)Income from discontinued operations, net of tax$4.5 $48.8 $9.1Our results of discontinued operations primarily include the operations of six long-term acute care hospitals (“LTCHs”). In August 2011, we completed a transaction to sell five LTCHs to certain subsidiaries of LifeCare Holdings, Inc. for an aggregate purchase price of $117.5 million. We closed the sixth LTCH in August 2011 and expect to sell the associated real estate. As discussed in Note 19,Contingencies and Other Commitments, in April 2011, we entered into a definitive settlement and release agreement with the state of Delaware (the “Delaware Settlement”) relating to a previously disclosed audit of unclaimed property conducted on behalf of Delaware and two other states by Kelmar Associates, LLC. During the year ended December 31, 2011, we recorded a $24.8 million gain in connection with this settlement as part of our results of discontinued operations. The impairment charges presented in the above table for 2011 related to the LTCH that was closed in 2011 and the Dallas Medical Center that was closed in 2008. We determined the fair value of the impaired long-lived assets at the hospitals based on the assets’ estimated fair value using valuation techniques that included third-party appraisals and offers from potential buyers. The impairment charge recorded in 2010 also related to the Dallas Medical Center. We determined the fair value of the impaired long-lived assets at the hospital primarily based on the assets’ estimated fair value using valuation techniques that included third-party appraisals and an offer from a potential buyer. During 2012, we recognized gains associated with the sale of the real estate associated with Dallas Medical Center and an investment we had in a cancer treatment center that was part of our former diagnostic division. As a result of the transaction discussed above to sell five of our LTCHS, we recorded a $65.6 million pre-tax gain as part of our results of discontinued operations during 2011. Income tax expense recorded as part of our results of discontinued operations during the year ended December 31, 2011 related primarily to the gain from the sale of five of our LTCHs and the Delaware Settlement. As discussed in Note 10,Self-Insured Risks, we insure a substantial portion of our professional liability, general liability, and workers’ compensation risks through a self-insured retention program underwritten by HCS. Expenses for retained professional and general liability risks and workers’ compensation risks associated with our divested surgery centers, outpatient, and diagnostic divisions and our former LTCHs have been included in our results of discontinued operations.Assets and liabilities in discontinued operations consist of the following (in millions):  As of December 31, 2012 2011Total current assets$0.4 $4.9Total long-term assets$5.0 $7.3Total current liabilities$5.2 $6.5Total long-term liabilities$0.6 $0.7As of December 31, 2012, assets and liabilities in discontinued operations primarily relate to the LTCH that was closed in 2011. As of December 31, 2011, assets and liabilities in discontinued operations primarily relate to working capital not included in the sale of five of our LTCHs, the LTCH that was closed in 2011, and the Dallas Medical Center. Current assets and long-term assets in the above table are included in Prepaid expenses and other current assets and Other long-term assets, respectively, in our consolidated balance sheets. Current liabilities and long-term liabilities in the above table are included in Other current liabilities and Other long-term liabilities, respectively, in our consolidated balance sheets. |

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| - Definition
The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).
+ References
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