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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Mar. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 2,111.6 |  | $ 2,100.8
Home Health and Hospice Segment [Member] | Certificates of need [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets |  | $ 2.0 |
Home Health and Hospice Segment [Member] | Tidewater and Care Resource Group [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill |  | 10.8 |
Other assets acquired |  | 0.2 |
Total assets acquired |  | 14.0 |
Accrued payroll |  | (0.1) |
Other current liabilities |  | (0.1) |
Other long-term liabilities |  | (0.1) |
Total liabilities assumed |  | (0.3) |
Net assets acquired |  | 13.7 |
Home Health and Hospice Segment [Member] | Tidewater and Care Resource Group [Member] | Noncompete agreements [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets |  | 0.2 |
Home Health and Hospice Segment [Member] | Tidewater and Care Resource Group [Member] | License [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets |  | $ 0.8 |

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