| **Investments in and Advances to Nonconsolidated Affiliates (Tables)**            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Investments in and Advances to Affiliates, Schedule of Investments [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Schedule of Aggregate Equity and Cost Method Investments                          | Our investments, which are included in Other long-term assets in our consolidated balance sheets, consist of the following (in millions): As of December 31, 2016 2015Equity method investments:   Capital contributions$0.9 $0.9Cumulative share of income97.8 88.0Cumulative share of distributions(86.0) (77.5) 12.7 11.4Cost method investments:   Capital contributions, net of distributions and impairments0.3 0.3Total investments in and advances to nonconsolidated affiliates$13.0 $11.7                                                                                                                                                                                                                                                                                                                                                                               |
| Schedule of Combined Assets, Liabilities, and Equity of Equity Method Affiliates  | Condensed statements of operations (in millions): For the Year Ended December 31, 2016 2015 2014Net operating revenues$44.8 $36.5 $50.2Operating expenses(24.3) (16.9) (25.9)Income from continuing operations, net of tax20.5 18.9 30.9Net income20.5 18.9 30.9The following summarizes the combined assets, liabilities, and equity and the combined results of operations of our equity method affiliates (on a 100% basis, in millions): As of December 31, 2016 2015Assets—   Current$13.1 $7.8Noncurrent19.2 20.5Total assets$32.3 $28.3Liabilities and equity—   Current liabilities$2.7 $1.4Noncurrent liabilities0.2 0.1Partners’ capital and shareholders’ equity—   HealthSouth12.7 11.4Outside partners16.7 15.4Total liabilities and equity$32.3 $28.3 |

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| - Definition
Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information.
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| - Definition
Tabular disclosure of investments in and advances to affiliates.  Does not include the tabular disclosure of the disaggregation of investments in and advances to affiliates across legal entities.
+ References
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