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Investments in and Advances to Nonconsolidated Affiliates - Textual (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) subsidiary | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Investments [Line Items] |  |  |
Number of partially-owned subsidiaries | subsidiary | 4 |  |
Number of general or limited partnerships, limited liability companies, or joint ventures | subsidiary | 3 |  |
Gain on consolidation of joint venture formerly accounted for under the equity method of accounting | $ 0.0 | $ 19.2 | $ 0.0
Jupiter Florida Home Health Agency |  |  |
Schedule of Investments [Line Items] |  |  |
Goodwill increase | 3.3 |  |
Gain on consolidation of joint venture formerly accounted for under the equity method of accounting | $ 2.2 |  |
Yuma Rehabilitation Hospital |  |  |
Schedule of Investments [Line Items] |  |  |
Goodwill increase |  | 24.9 |
Gain on consolidation of joint venture formerly accounted for under the equity method of accounting |  | $ 19.2 |
Minimum |  |  |
Schedule of Investments [Line Items] |  |  |
Affiliates ownership percentage | 8.00% |  |
Maximum |  |  |
Schedule of Investments [Line Items] |  |  |
Affiliates ownership percentage | 51.00% |  |

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