| **Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (USD $)In Millions, unless otherwise specified** | Total   | Common Stock | Capital in Excess of Par Value | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Noncontrolling Interests | Comprehensive Income |
|--------------------------------------------------------------------------------------------------------------------------|---------|--------------|--------------------------------|---------------------|-----------------------------------------------|----------------|--------------------------|----------------------|
| Balance at beginning of period at Dec. 31, 2010                                                                          | $ (2.2) | $ 1.0        | $ 2,873.5                      | $ (2,818.4)         | $ 0.5                                         | $ (141.8)      | $ 83.0                   |                 |
| Balance at beginning of period, Shares at Dec. 31, 2010                                                                  |    | 93.4         |                           |                |                                          |           |                     |                 |
| **Comprehensive income:**                                                                                                |    |         |                           |                |                                          |           |                     |                 |
| Net income                                                                                                               | 192.1   |         |                           | 158.7               |                                          |           | 33.4                     | 192.1                |
| Other comprehensive income (loss), net of tax                                                                            | (0.3)   |         |                           |                | (0.3)                                         |           |                     | (0.3)                |
| Comprehensive income                                                                                                     | 191.8   |         |                           |                |                                          |           |                     | 191.8                |
| Receipt of treasury stock                                                                                                | (4.3)   |         |                           |                |                                          | (4.3)          |                     |                 |
| Receipt of treasury stock, Shares                                                                                        |    | (0.2)        |                           |                |                                          |           |                     |                 |
| Dividends declared on convertible perpetual preferred stock dividends                                                    | (19.5)  |         | (19.5)                         |                |                                          |           |                     |                 |
| Stock-based compensation                                                                                                 | 14.4    |         | 14.4                           |                |                                          |           |                     |                 |
| Stock Options Exercised, Shares                                                                                          |    | 0.2          |                           |                |                                          |           |                     |                 |
| Stock Options Exercised                                                                                                  | 4.4     |         | 4.4                            |                |                                          |           |                     |                 |
| Distributions declared                                                                                                   | (29.5)  |         |                           |                |                                          |           | (29.5)                   |                 |
| Other                                                                                                                    | (3.3)   |         | 2.2                            |                |                                          | (2.5)          | (3.0)                    |                 |
| Other, Shares                                                                                                            |    | 1.9          |                           |                |                                          |           |                     |                 |
| Balance at end of period at Sep. 30, 2011                                                                                | 151.8   | 1.0          | 2,875.0                        | (2,659.7)           | 0.2                                           | (148.6)        | 83.9                     |                 |
| Balance at end of period, Shares at Sep. 30, 2011                                                                        |    | 95.3         |                           |                |                                          |           |                     |                 |
| Balance at beginning of period at Dec. 31, 2011                                                                          | 201.6   | 1.0          | 2,874.7                        | (2,609.7)           | (0.2)                                         | (148.8)        | 84.6                     |                 |
| Balance at beginning of period, Shares at Dec. 31, 2011                                                                  |    | 95.2         |                           |                |                                          |           |                     |                 |
| **Comprehensive income:**                                                                                                |    |         |                           |                |                                          |           |                     |                 |
| Net income                                                                                                               | 176.6   |         |                           | 138.0               |                                          |           | 38.6                     | 176.6                |
| Other comprehensive income (loss), net of tax                                                                            | 2.1     |         |                           |                | 2.1                                           |           |                     | 2.1                  |
| Comprehensive income                                                                                                     | 178.7   |         |                           |                |                                          |           |                     | 178.7                |
| Receipt of treasury stock                                                                                                | (11.9)  |         |                           |                |                                          | (11.9)         |                     |                 |
| Receipt of treasury stock, Shares                                                                                        |    | (0.7)        |                           |                |                                          |           |                     |                 |
| Dividends declared on convertible perpetual preferred stock dividends                                                    | (18.1)  |         | (18.1)                         |                |                                          |           |                     |                 |
| Stock-based compensation                                                                                                 | 18.1    |         | 18.1                           |                |                                          |           |                     |                 |
| Distributions declared                                                                                                   | (34.2)  |         |                           |                |                                          |           | (34.2)                   |                 |
| Capital Contributions from Consolidated Affiliates                                                                       | 11.4    |         |                           |                |                                          |           | 11.4                     |                 |
| Consolidation of St. Vincent Rehabilitation Hospital                                                                     | 13.9    |         |                           |                |                                          |           | 13.9                     |                 |
| Other                                                                                                                    | (3.5)   |         | 1.6                            |                |                                          | (2.1)          | (3.0)                    |                 |
| Other, Shares                                                                                                            |    | 1.2          |                           |                |                                          |           |                     |                 |
| Balance at end of period at Sep. 30, 2012                                                                                | $ 356.0 | $ 1.0        | $ 2,876.3                      | $ (2,471.7)         | $ 1.9                                         | $ (162.8)      | $ 111.3                  |                 |
| Balance at end of period, Shares at Sep. 30, 2012                                                                        |    | 95.7         |                           |                |                                          |           |                     |                 |

| X                                                                                                                                                                                                                                                                                                  |
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Number of common stock shares reacquired during the period and currently held in treasury.
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Value of common stock reacquired during the period and currently held in treasury.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of preferred stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.
+ References
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| - Definition
Increase in noncontrolling interest balance because of a business combination that occurred during the period.
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total contributions made by each class of partners (i.e., general, limited and preferred partners).
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
+ References
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| - Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents movements in the number of shares included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
+ References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of share options (or share units) exercised during the current period.
+ References
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| - Definition
Value of stock issued as a result of the exercise of stock options.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644
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