Business Combinations - Net Cash Paid for Acquisitions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Net cash paid for acquisitions			$ 1.1	$ 231.2
Inpatient Rehabilitation \| Portercare Adventist and Premier Health Partners
Business Acquisition [Line Items]
Fair value of assets acquired	$ 0.0	$ 0.5	1.7	0.5
Goodwill	0.0	4.8	9.2	4.8
Fair value of liabilities assumed	0.0	(0.2)	0.0	(0.2)
Fair value of noncontrolling interest owned by joint venture partner	0.0	(5.1)	(10.9)	(5.1)
Net cash paid for acquisitions	0.0	0.0	0.0	0.0
Home Health and Hospice \| Generation Solutions of Lynchburg
Business Acquisition [Line Items]
Fair value of assets acquired	0.0	68.6	0.1	71.8
Goodwill	0.0	163.9	1.0	174.7
Fair value of liabilities assumed	0.0	(15.0)	0.0	(15.3)
Net cash paid for acquisitions	$ 0.0	$ 217.5	$ 1.1	$ 231.2

Business Combination, Noncontrolling Interest, Fair Value

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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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