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Summary of Significant Accounting Policies - Net Operating Revenues & Accounts Receivable (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Concentration Risk [Line Items] |  |  |
Net operating revenues | $ 5,121.6 | $ 4,644.4 | $ 4,605.0
Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 4,015.0 | 3,566.2 | 3,513.0
Home Health and Hospice |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 1,106.6 | 1,078.2 | 1,092.0
Payor Source | Revenue from Contract with Customer Benchmark |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 5,121.6 | 4,644.4 | 4,605.0
Payor Source | Revenue from Contract with Customer Benchmark | Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 4,015.0 | 3,566.2 | 3,513.0
Payor Source | Revenue from Contract with Customer Benchmark | Home Health and Hospice |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 1,106.6 | 1,078.2 | 1,092.0
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 3,496.2 | 3,271.5 | 3,457.3
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor | Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 2,589.7 | 2,375.5 | 2,537.3
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor | Home Health and Hospice |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 906.5 | 896.0 | 920.0
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 727.0 | 661.1 | 487.4
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor | Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 609.6 | 544.9 | 375.5
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor | Home Health and Hospice |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 117.4 | 116.2 | 111.9
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 549.9 | 419.2 | 381.8
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor | Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 484.5 | 371.4 | 342.7
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor | Home Health and Hospice |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 65.4 | 47.8 | 39.1
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 178.6 | 155.7 | 128.7
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor | Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 163.1 | 140.1 | 110.3
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor | Home Health and Hospice |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 15.5 | 15.6 | 18.4
Payor Source | Revenue from Contract with Customer Benchmark | Other third-party payors | Third-Party Payor |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 46.0 | 43.0 | 43.4
Payor Source | Revenue from Contract with Customer Benchmark | Other third-party payors | Third-Party Payor | Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 46.0 | 43.0 | 43.4
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 | 23.4 | 22.5 | 30.2
Payor Source | Revenue from Contract with Customer Benchmark | Workers’ compensation | Third-Party Payor | Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 23.1 | 21.5 | 29.2
Payor Source | Revenue from Contract with Customer Benchmark | Workers’ compensation | Third-Party Payor | Home Health and Hospice |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 0.3 | 1.0 | 1.0
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 20.1 | 20.1 | 23.9
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay | Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 19.3 | 19.2 | 23.3
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay | Home Health and Hospice |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 0.8 | 0.9 | 0.6
Payor Source | Revenue from Contract with Customer Benchmark | Other income |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 80.4 | 51.3 | 52.3
Payor Source | Revenue from Contract with Customer Benchmark | Other income | Inpatient Rehabilitation |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | 79.7 | 50.6 | 51.3
Payor Source | Revenue from Contract with Customer Benchmark | Other income | Home Health and Hospice |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues | $ 0.7 | $ 0.7 | $ 1.0
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) | 63.60% | 66.50% |
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) | 27.40% | 25.00% |
Payor Source | Accounts Receivable | Medicaid | Third-Party Payor |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues by payor source (percent) | 3.70% | 3.70% |
Payor Source | Accounts Receivable | Other third-party payors | Third-Party Payor |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues by payor source (percent) | 2.60% | 2.70% |
Payor Source | Accounts Receivable | Workers’ compensation | Third-Party Payor |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues by payor source (percent) | 1.50% | 1.20% |
Payor Source | Accounts Receivable | Patients | Self-Pay |  |  |
Concentration Risk [Line Items] |  |  |
Net operating revenues by payor source (percent) | 1.20% | 0.90% |

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