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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 1,971.7 | $ 1,927.2
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member] |  |
Business Acquisition [Line Items] |  |
Property and equipment | 0.1 |
Goodwill | 24.0 |
Total assets acquired | 35.0 |
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member] | Noncompete Agreements [Member] |  |
Business Acquisition [Line Items] |  |
Identifiable intangible assets | 0.6 |
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member] | Trade Names [Member] |  |
Business Acquisition [Line Items] |  |
Identifiable intangible assets | 0.5 |
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member] | Certificate of Need [Member] |  |
Business Acquisition [Line Items] |  |
Identifiable intangible assets | 9.8 |
Home Health and Hospice Segment [Member] |  |
Business Acquisition [Line Items] |  |
Net assets acquired | 25.7 |
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member] |  |
Business Acquisition [Line Items] |  |
Total current assets | 0.1 |
Goodwill | 20.5 |
Total assets acquired | 25.9 |
Total liabilities assumed | 0.2 |
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member] | Noncompete Agreements [Member] |  |
Business Acquisition [Line Items] |  |
Identifiable intangible assets | 0.7 |
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member] | Trade Names [Member] |  |
Business Acquisition [Line Items] |  |
Identifiable intangible assets | 0.1 |
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member] | Certificate of Need [Member] |  |
Business Acquisition [Line Items] |  |
Identifiable intangible assets | 0.7 |
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member] | License [Member] |  |
Business Acquisition [Line Items] |  |
Identifiable intangible assets | $ 3.8 |

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