| **Business Combinations - Net Cash Paid for Acquisition (Details) - USD ($) $ in Millions**                                                 |         | 12 Months Ended |           |
|---------------------------------------------------------------------------------------------------------------------------------------------|---------|-----------------|-----------|
||
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Goodwill                                                                                                                                    |    | $ 2,100.8       | $ 1,972.6 | $ 1,927.2 | $ 1,890.1 |
| Net cash paid for acquisition                                                                                                               |    | 143.9           | 38.8      | 48.1 |   |
| Inpatient Rehabilitation Segment [Member]                                                                                                   |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Goodwill                                                                                                                                    |    | 1,189.2         | 1,166.0   | 1,142.0 | 1,133.1 |
| Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]                                    |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Fair value of assets acquired                                                                                                               |    |            | 11.0      |   |   |
| Goodwill                                                                                                                                    |    |            | 24.0      |   |   |
| Noncontrolling interests                                                                                                                    |    |            | (24.1)    |   |   |
| Inpatient Rehabilitation Segment [Member] | Murrells Inlet, Winston-Salem and Littleton [Member]                                            |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Fair value of assets acquired                                                                                                               |    | 16.3            |      |   |   |
| Goodwill                                                                                                                                    |    | 23.2            |      |   |   |
| Fair value of liabilities assumed                                                                                                           |    | (0.2)           |      |   |   |
| Noncontrolling interests                                                                                                                    |    | (39.3)          |      |   |   |
| Net cash paid for acquisition                                                                                                               |    | 0.0             |      |   |   |
| Inpatient Rehabilitation Segment [Member] | Hot Springs, Bryan and Broken Arrow [Member]                                                    |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Fair value of assets acquired                                                                                                               |    |            |      | 6.7 |   |
| Goodwill                                                                                                                                    |    |            |      | 9.4 |   |
| Noncontrolling interests                                                                                                                    |    |            |      | (16.1) |   |
| Net cash paid for acquisition                                                                                                               |    |            |      | 0.0 |   |
| Home Health and Hospice Segment [Member]                                                                                                    |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Goodwill                                                                                                                                    |    | 911.6           | 806.6     | 785.2 | $ 757.0 |
| Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, VNA, Ware, and Pickens County [Member]                              |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Fair value of assets acquired                                                                                                               |    |            | 6.8       |   |   |
| Goodwill                                                                                                                                    |    |            | 21.4      |   |   |
| Fair value of liabilities assumed                                                                                                           |    |            | 0.3       |   |   |
| Net cash paid for acquisition                                                                                                               |    |            | 27.9      |   |   |
| Home Health and Hospice Segment [Member] | Camellia Healthcare [Member]                                                                     |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Fair value of assets acquired                                                                                                               | $ 41.0  |            |      |   |   |
| Goodwill                                                                                                                                    | 96.1    |            |      |   |   |
| Fair value of liabilities assumed                                                                                                           | (5.7)   |            |      |   |   |
| Net cash paid for acquisition                                                                                                               | $ 131.4 |            |      |   |   |
| Home Health and Hospice Segment [Member] | Golden Age, MSA and Tenet [Member]                                                               |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Fair value of assets acquired                                                                                                               |    | 4.3             |      |   |   |
| Goodwill                                                                                                                                    |    | 8.9             |      |   |   |
| Fair value of liabilities assumed                                                                                                           |    | 0.1             |      |   |   |
| Noncontrolling interests                                                                                                                    |    | (0.6)           |      |   |   |
| Net cash paid for acquisition                                                                                                               |    | $ 12.5          |      |   |   |
| Home Health and Hospice Segment [Member] | Series of individually immaterial business acquisitions [Member]                                 |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Fair value of assets acquired                                                                                                               |    |            |      | 7.1 |   |
| Goodwill                                                                                                                                    |    |            |      | 41.4 |   |
| Fair value of liabilities assumed                                                                                                           |    |            |      | 0.4 |   |
| Net cash paid for acquisition                                                                                                               |    |            |      | $ 48.1 |   |
| Corporate Joint Venture [Member] | Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member] |    |            |      |   |   |
| **Business Acquisition [Line Items]**                                                                                                       |    |            |      |   |   |
| Goodwill                                                                                                                                    |    |            | 24.0      |   |   |
| Net cash paid for acquisition                                                                                                               |    |            | $ 10.9    |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Net of Cash Acquired
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of liabilities assumed at the acquisition date.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.
+ References
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| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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