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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 10 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
2018 Acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  | $ 4,337.4 | $ 4,039.9 |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  | 300.0 | 289.0 |  |
2017 Acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  | $ 32.9 |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  | $ (6.3) |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  | 3,996.1 | $ 3,771.5 |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  | $ 260.3 | 254.8 |
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
Inpatient Rehabilitation Segment [Member] | 2018 Acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 9.1 |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | $ (1.6) |  |  |  |  |  |  |
Home Health and Hospice Segment [Member] | 2018 Acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  | 3.5 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  | $ (0.3) |  |  |
Home Health and Hospice Segment [Member] | Camellia Healthcare [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | $ 50.0 |  |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | $ (0.9) |  |  |  |  |  |

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