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Segment Reporting Segment Reporting - Reconciliation of Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | $ (171.7) | $ (133.4) | $ (133.3)
Depreciation and amortization |  |  |  |  |  |  |  |  | (183.8) | (172.6) | (139.7)
Government, class action, and related settlements |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (7.5)
Professional fees—accounting, tax, and legal |  |  |  |  |  |  |  |  | 0.0 | (1.9) | (3.0)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (10.7) | (7.4) | (22.4)
Net income attributable to noncontrolling interests | $ 25.9 | $ 19.2 | $ 16.4 | $ 17.6 | $ 16.8 | $ 16.4 | $ 18.6 | $ 18.7 | 79.1 | 70.5 | 69.7
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 496.4 | 482.0 | 395.6
Inpatient Rehabilitation Hospital and Home Health and Hospice [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total segment Adjusted EBITDA |  |  |  |  |  |  |  |  | 947.1 | 899.6 | 774.1
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | (171.7) | (133.4) | (133.3)
Depreciation and amortization |  |  |  |  |  |  |  |  | (183.8) | (172.6) | (139.7)
Loss on disposal of assets |  |  |  |  |  |  |  |  | (4.6) | (0.7) | (2.6)
Government, class action, and related settlements |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (7.5)
Professional fees—accounting, tax, and legal |  |  |  |  |  |  |  |  | 0.0 | (1.9) | (3.0)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (10.7) | (7.4) | (22.4)
Interest expense and amortization of debt discounts and fees |  |  |  |  |  |  |  |  | (154.4) | (172.1) | (142.9)
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 79.1 | 70.5 | 69.7
Tax reform impact on noncontrolling interests |  |  |  |  |  |  |  |  | (4.6) | 0.0 | 0.0
Gain related to SCA equity interest |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 3.2

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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