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Business Combinations - Net Cash Paid for Acquisition (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2015 | Dec. 31, 2014 | Nov. 30, 2015 | Oct. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | $ 1,084.0 |  |  | $ 1,927.2 | $ 1,890.1 | $ 1,084.0 | $ 456.9
Net cash paid for acquisition |  |  |  |  | 48.1 | 985.1 | 694.8 |
All Other Acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of assets acquired |  | 60.1 |  |  |  |  | 60.1 |
Goodwill |  | 34.6 |  |  |  |  | 34.6 |
Fair value of liabilities assumed |  | (21.2) |  |  |  |  | (21.2) |
Noncontrolling interests |  | (18.3) |  |  |  |  | (18.3) |
Fair value of equity interest prior to acquisition |  |  |  |  |  |  | (35.0) |
Net cash paid for acquisition |  |  |  |  |  |  | 20.2 |
Cash acquired in acquisition |  |  |  |  |  |  | 5.1 |
Home Health and Hospice Segment [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | 592.5 |  |  | 785.2 | 757.0 | 592.5 | 0.0
Home Health and Hospice Segment [Member] | All Other Acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  | 7.1 | 10.4 |  |
Goodwill |  |  |  |  | 41.4 | 20.3 |  |
Fair value of liabilities assumed |  |  |  |  | (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 |  |  |  |  |
Home Health and Hospice Segment [Member] | Encompass [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of assets acquired |  | 260.1 |  |  |  |  | 260.1 |
Goodwill |  | 592.5 |  |  |  |  | 592.5 |
Fair value of liabilities assumed |  | (113.5) |  |  |  |  | (113.5) |
Noncontrolling interests |  | (64.5) |  |  |  |  | (64.5) |
Net cash paid for acquisition |  |  |  |  |  |  | 674.6 |
Cash acquired in acquisition |  | 20.9 |  |  |  |  |  |
Inpatient Rehabilitation Segment [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | $ 491.5 |  |  | 1,142.0 | 1,133.1 | $ 491.5 | $ 456.9
Inpatient Rehabilitation Segment [Member] | All Other Acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  | 6.7 | 62.8 |  |
Goodwill |  |  |  |  | 9.4 | 0.7 |  |
Fair value of liabilities assumed |  |  |  |  | (16.1) | (2.7) |  |
Noncontrolling interests |  |  |  |  |  | (4.2) |  |
Net cash paid for acquisition |  |  |  |  | $ 0.0 | $ 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 |  |  |  |

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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=64834752&loc=SL49117168-202975 + Details
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