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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions | Jan. 01, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 2,456.5 | $ 2,427.9
Home Health and Hospice | Saint Alphonsus |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents | $ 0.7 |  |
Accounts receivable, net | 1.6 |  |
Operating lease right-of-use-assets | 0.3 |  |
Goodwill | 28.7 |  |
Total assets acquired | 32.6 |  |
Liabilities assumed: |  |  |
Current operating lease liabilities | 0.1 |  |
Accounts payable | 0.1 |  |
Accrued payroll | 0.2 |  |
Other current liabilities | 0.2 |  |
Long-term operating lease liabilities | 0.2 |  |
Total liabilities assumed | 0.8 |  |
Noncontrolling interests | 15.9 |  |
Net assets acquired | 15.9 |  |
Home Health and Hospice | Noncompete agreements | Saint Alphonsus |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 0.2 |  |
Liabilities assumed: |  |  |
Finite-lived intangible asset useful life | 5 years |  |
Home Health and Hospice | Trade name | Saint Alphonsus |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 0.1 |  |
Liabilities assumed: |  |  |
Finite-lived intangible asset useful life | 6 months |  |
Home Health and Hospice | Licenses | Saint Alphonsus |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 0.9 |  |
Liabilities assumed: |  |  |
Finite-lived intangible asset useful life | 10 years |  |
Home Health and Hospice | Internal-use software | Saint Alphonsus |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 0.1 |  |
Liabilities assumed: |  |  |
Finite-lived intangible asset useful life | 3 years |  |

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