Business Combinations - Net Cash Paid for Acquisitions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 01, 2021
Business Acquisition [Line Items]
Net cash paid for acquisitions			$ 98.8	$ 1.1
Inpatient Rehabilitation Segment \| Shannon Medical, Heritage Valley Health System And ECHD Ventures
Business Acquisition [Line Items]
Fair value of assets acquired, net of $0.8 million of cash acquired in 2021	$ 0.6	$ 0.0	1.4	1.7
Goodwill	5.3	0.0	8.8	9.2
Fair value of noncontrolling interest owned by joint venture partner	(5.9)	0.0	(9.1)	(10.9)
Net cash paid for acquisitions	0.0	0.0	1.1	0.0
Home Health and Hospice \| Frontier Home Health and Hospice
Business Acquisition [Line Items]
Cash acquired					$ 0.8
Fair value of assets acquired, net of $0.8 million of cash acquired in 2021	0.0	0.0	11.9	0.1
Goodwill	0.0	0.0	90.1	1.0
Fair value of liabilities assumed	0.0	0.0	(2.7)	0.0
Fair value of noncontrolling interest owned by joint venture partner	0.0	0.0	(1.6)	0.0
Net cash paid for acquisitions	$ 0.0	$ 0.0	$ 97.7	$ 1.1

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The fair value of assets acquired in noncash investing or financing activities.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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The total amount of [all] liabilities that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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