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Summary of Significant Accounting Policies - Net Operating Revenues & Accounts Receivable (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues | $ 1,214.4 | $ 1,173.9 | $ 1,074.1 | $ 1,182.0 | $ 1,184.4 | $ 1,161.6 | $ 1,135.0 | $ 1,124.0 | $ 4,644.4 | $ 4,605.0 | $ 4,277.3
Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,566.2 | 3,513.0 | 3,346.2
Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 1,078.2 | 1,092.0 | 931.1
Payor Source | Revenue from Contract with Customer Benchmark |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 4,644.4 | 4,605.0 | 4,277.3
Payor Source | Revenue from Contract with Customer Benchmark | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,566.2 | 3,513.0 | 3,346.2
Payor Source | Revenue from Contract with Customer Benchmark | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 1,078.2 | 1,092.0 | 931.1
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,271.5 | 3,457.3 | 3,246.2
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 2,375.5 | 2,537.3 | 2,451.7
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 896.0 | 920.0 | 794.5
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 661.1 | 487.4 | 395.1
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 544.9 | 375.5 | 306.5
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 116.2 | 111.9 | 88.6
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 419.2 | 381.8 | 376.5
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 371.4 | 342.7 | 343.3
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 47.8 | 39.1 | 33.2
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 155.7 | 128.7 | 112.9
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 140.1 | 110.3 | 101.3
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 15.6 | 18.4 | 11.6
Payor Source | Revenue from Contract with Customer Benchmark | Other Third-party Payors | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 43.0 | 43.4 | 49.0
Payor Source | Revenue from Contract with Customer Benchmark | Other Third-party Payors | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 43.0 | 43.4 | 49.0
Payor Source | Revenue from Contract with Customer Benchmark | Other Third-party Payors | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Payor Source | Revenue from Contract with Customer Benchmark | Workers' Compensation | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 22.5 | 30.2 | 28.9
Payor Source | Revenue from Contract with Customer Benchmark | Workers' Compensation | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 21.5 | 29.2 | 27.4
Payor Source | Revenue from Contract with Customer Benchmark | Workers' Compensation | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 1.0 | 1.0 | 1.5
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 20.1 | 23.9 | 19.5
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 19.2 | 23.3 | 18.7
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 0.9 | 0.6 | 0.8
Payor Source | Revenue from Contract with Customer Benchmark | Other income |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 51.3 | 52.3 | 49.2
Payor Source | Revenue from Contract with Customer Benchmark | Other income | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 50.6 | 51.3 | 48.3
Payor Source | Revenue from Contract with Customer Benchmark | Other income | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | $ 0.7 | $ 1.0 | $ 0.9
Payor Source | Accounts Receivable |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Payor Source | Accounts Receivable | Medicare | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 66.50% | 72.10% |
Payor Source | Accounts Receivable | Managed care and other discount plans, including Medicare Advantage | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 25.00% | 20.10% |
Payor Source | Accounts Receivable | Medicaid | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 3.70% | 3.10% |
Payor Source | Accounts Receivable | Other Third-party Payors | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 2.70% | 2.60% |
Payor Source | Accounts Receivable | Workers' Compensation | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 1.20% | 1.20% |
Payor Source | Accounts Receivable | Patients | Self-Pay |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 0.90% | 0.90% |

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