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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Revenue Recognition (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
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues | $ 1,019.7 | $ 995.6 | $ 981.3 | $ 974.8 | $ 949.9 | $ 926.8 | $ 920.7 | $ 909.8 | $ 3,971.4 | $ 3,707.2 | $ 3,162.9
Less: Provision for doubtful accounts |  |  |  |  |  |  |  |  | (52.4) | (61.2) | (47.2)
Net income attributable to Encompass Health | $ 60.6 | $ 65.9 | $ 63.0 | $ 66.8 | $ 65.3 | $ 61.7 | $ 62.6 | $ 58.0 | 256.3 | 247.6 | $ 183.1
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,919.0 | 3,646.0 |
Less: Provision for doubtful accounts |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Net income attributable to Encompass Health |  |  |  |  |  |  |  |  | 256.3 | 247.6 |
Adjustments for ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | (52.4) | (61.2) |
Less: Provision for doubtful accounts |  |  |  |  |  |  |  |  | (52.4) | (61.2) |
Net income attributable to Encompass Health |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
As Reported [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,971.4 | 3,707.2 |
Less: Provision for doubtful accounts |  |  |  |  |  |  |  |  | 52.4 | 61.2 |
Net income attributable to Encompass Health |  |  |  |  |  |  |  |  | $ 256.3 | $ 247.6 |

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