| **Earnings per Common Share Earnings per Common Share - Schedule of Warrant Activity (Details) - $ / shares shares in Millions** | 1 Months Ended |         |         |
|----------------------------------------------------------------------------------------------------------------------------------|----------------|---------|---------|
||
| **Class of Warrant or Right [Line Items]**                                                                                       |           |    |    |
| Common stock warrants outstanding as of December 31, 2016                                                                        | 8.2            |    |    |
| Expired                                                                                                                          | (1.1)          |    |    |
| Common stock warrants outstanding as of January 17, 2017                                                                         | 0.0            |    |    |
| Weighted average exercise price (in dollars per share)                                                                           | $ 41.40        | $ 41.40 | $ 41.40 |
| Cashless exercise [Member]                                                                                                       |           |    |    |
| **Class of Warrant or Right [Line Items]**                                                                                       |           |    |    |
| Exercised                                                                                                                        | (6.5)          |    |    |
| Weighted average exercise price (in dollars per share)                                                                           | $ 41.40        |    |    |
| Cash exercise [Member]                                                                                                           |           |    |    |
| **Class of Warrant or Right [Line Items]**                                                                                       |           |    |    |
| Exercised                                                                                                                        | (0.6)          |    |    |
| Weighted average exercise price (in dollars per share)                                                                           | $ 41.40        |    |    |

| X                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of warrants for which the right to exercise has lapsed under the terms of the contract or agreement.
+ References
No definition available.
+ Details**Name:**ehc_ClassOfWarrantOrRightNumberofSecuritiesExpired**Namespace Prefix:**ehc_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Exercise price per share or per unit of warrants or rights outstanding.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690
+ Details**Name:**us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1**Namespace Prefix:**us-gaap_**Data Type:**num:perShareItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details**Name:**us-gaap_ClassOfWarrantOrRightLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.
+ References
No definition available.
+ Details**Name:**us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of warrants or rights outstanding.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690
+ Details**Name:**us-gaap_ClassOfWarrantOrRightOutstanding**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ClassOfWarrantOrRightAxis=ehc_CashlessexerciseMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ClassOfWarrantOrRightAxis=ehc_CashexerciseMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |