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Business Combinations - Net Cash Paid for Acquisition (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2015 | Nov. 30, 2015 | Oct. 31, 2015 | Apr. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  | $ 45.4 | $ 51.4 | $ 806.1 |
Goodwill |  |  |  |  | 1,972.6 | 1,927.2 | 1,890.1 | $ 1,084.0
Net cash paid for acquisition |  |  |  |  | 38.8 | 48.1 | 985.1 |
Home Health and Hospice Segment [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  | 21.4 | 42.5 | 164.5 |
Goodwill |  |  |  |  | 806.6 | 785.2 | 757.0 | 592.5
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 |  |  |
Acquisitions |  |  |  |  | 21.4 |  |  |
Goodwill |  |  |  |  | 21.4 |  |  |
Fair value of liabilities assumed |  |  |  |  | (0.3) |  |  |
Net cash paid for acquisition |  |  |  |  | 27.9 |  |  |
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed |  |  |  |  | (0.3) |  |  |
Home Health and Hospice Segment [Member] | Series of individually immaterial business acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  | 7.1 |  | 10.4 |
Goodwill |  |  |  |  | 41.4 | 41.4 | 20.3 |
Fair value of liabilities assumed |  |  |  |  | 0.4 | 0.4 | 0.2 |
Net cash paid for acquisition |  |  |  |  | 48.1 |  | 30.5 |
Home Health and Hospice Segment [Member] | CareSouth [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of assets acquired | $ 48.0 | $ 48.0 |  |  |  |  |  |
Goodwill | 143.3 | 143.3 |  |  |  |  |  |
Fair value of liabilities assumed | (17.7) | (17.7) |  |  |  |  |  |
Noncontrolling interests | (4.3) | (4.3) |  |  |  |  |  |
Net cash paid for acquisition | $ 169.3 |  |  |  |  |  |  |
Cash acquired in acquisition |  | $ 0.4 |  |  |  |  |  |
Inpatient Rehabilitation Segment [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  | 24.0 | 8.9 | 641.6 |
Goodwill |  |  |  |  | 1,166.0 | 1,142.0 | 1,133.1 | $ 491.5
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair Value of Assets Acquired |  |  |  |  | 11.0 |  |  |
Acquisitions |  |  |  |  | 24.0 |  |  |
Business Combination, Acquisition Of Less Than 100 Percent Noncontrolling Interest, Fair Value Of Equity Interest |  |  |  |  | (24.1) |  |  |
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 |  |
Fair value of liabilities assumed |  |  |  |  |  | (16.1) |  |
Net cash paid for acquisition |  |  |  |  |  | $ 0.0 |  |
Inpatient Rehabilitation Segment [Member] | Series of individually immaterial business acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisitions |  |  |  | $ 0.7 |  |  |  |
Fair value of assets acquired |  |  |  |  |  |  | 62.8 |
Goodwill |  |  |  |  |  |  | 0.7 |
Fair value of liabilities assumed |  |  |  |  |  |  | 2.7 |
Noncontrolling interests |  |  |  |  |  |  | 4.2 |
Net cash paid for acquisition |  |  |  |  |  |  | $ 56.6 |
Inpatient Rehabilitation Segment [Member] | Reliant [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  | $ 316.6 |  |  |  |  |
Goodwill |  |  | 642.6 |  |  |  |  |
Fair value of liabilities assumed |  |  | (230.0) |  |  |  |  |
Noncontrolling interests |  |  | (0.4) |  |  |  |  |
Net cash paid for acquisition |  |  | 728.8 |  |  |  |  |
Cash acquired in acquisition |  |  | $ 42.6 |  |  |  |  |
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 |  |  |

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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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