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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
2014 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  | $ 27.2 |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  | 4.0 |
Business Acquisition, Pro Forma Revenue |  |  | 2,799.8 | $ 2,627.6
Business Acquisition, Pro Forma Net Income (Loss) |  |  | 237.5 | $ 311.3
2016 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 27.4 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | (2.2) |  |  |
Business Acquisition, Pro Forma Revenue | 3,745.6 | $ 3,217.1 |  |
Business Acquisition, Pro Forma Net Income (Loss) | $ 252.2 | 187.3 |  |
2015 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Pro Forma Revenue |  | 3,479.9 | 2,851.0 |
Business Acquisition, Pro Forma Net Income (Loss) |  | 234.0 | $ 276.9 |
Inpatient Rehabilitation Segment [Member] | All Other Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 54.7 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | 1.7 |  |
Inpatient Rehabilitation Segment [Member] | Reliant [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 63.7 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | 11.2 |  |
Home Health and Hospice Segment [Member] | All Other Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 17.8 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | 1.2 |  |
Home Health and Hospice Segment [Member] | CareSouth [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 19.2 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | $ 2.5 |  |

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