Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions	Jan. 01, 2022	Jun. 30, 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