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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