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Long-term Debt - Textual (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Sep. 29, 2017 USD ($) | May 31, 2017 USD ($) shares | Sep. 30, 2016 USD ($) | May 31, 2016 USD ($) | Mar. 31, 2016 USD ($) | Nov. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Aug. 31, 2015 USD ($) | Mar. 31, 2015 USD ($) | Jan. 31, 2015 USD ($) | Sep. 30, 2014 USD ($) | Nov. 30, 2013 USD ($) shares | Oct. 31, 2012 USD ($) | Sep. 30, 2012 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 shares | May 31, 2016 USD ($) | Dec. 31, 2013 | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Sep. 01, 2019 | Jul. 01, 2017 | May 01, 2017 | Oct. 31, 2015 USD ($) | Sep. 11, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,700,000 | $ 7,400,000 | $ 22,400,000 |  |  |  |  |
Senior secured leverage ratio maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |  |  |  |
Repayments made on debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 129,900,000 | 202,100,000 | 597,400,000 |  |  |  |  |
Conversion of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 319,400,000 | $ 0 | $ 0 |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 8,500,000 | 8,300,000 |  |  |  |  |
Capital Lease Obligations [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  | 2.00% |  |  |  |  |  |  |
Capital Lease Obligations [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  | 11.00% |  |  |  |  |  |  |
Term Loan Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio under the financial covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50 |  |  |  | 4.50 |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |
Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares exchanged for convertible debt (shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 257,110 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt dividend rate (percent) |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments made on debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 195,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facilities [Member] | Term Loan Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments made on debt |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | $ 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2015 & 2016 Credit Agreement [Member] [Member] | Term Loan Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
Percentageof aggregate principal amount outstanding (percent) |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75 |  |  |  | 1.75 |  |  |  |  |  |  |
Maximum leverage ratio under the financial covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50 |  |  | 4.25 |  |  |
Proceeds from credit facility |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining capacity under credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |
The 2015 & 2016 Credit Agreement [Member] [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 260,000,000 |  |  |  |  |  |
The 2015 & 2016 Credit Agreement [Member] [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |
5.75% Senior Notes Due 2025 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds for offering |  |  |  |  |  |  | $ 344,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  | Sep. 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  | 5.75% | 5.75% |  |  |  |  |  |
The Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding under letter of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,400,000 |  |  |  | $ 35,400,000 | $ 33,300,000 |  |  |  |  |  |
The Credit Agreement [Member] | Term Loan Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentageof aggregate principal amount outstanding (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  | 1.25% |  |  |  |  |  |  |
Commitment fee (percent) | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio maximum | 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment limit under the credit agreement's negative covenant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |
The Credit Agreement [Member] | Federal Funds Effective Swap Rate [Member] | Term Loan Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate (percent) | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement [Member] | Scenario, Forecast [Member] | Term Loan Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio under the financial covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.25 |  |  |  |
The Credit Agreement [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 260,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable interest rate under credit facility (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.10% |  |  |  | 3.10% | 2.70% |  |  |  |  |  |
7.25% and 7.75% Senior Notes due 2018 and 2022, Respectively [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments made on debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
5.75% Senior Notes Due 2024 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 350,000,000 |  | $ 400,000,000 | $ 175,000,000 |  |  | 275,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt issue price as percentage of principal (percent) |  |  |  |  |  |  |  | 100.50% |  | 102.00% | 103.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds for offering |  |  |  |  |  |  |  | $ 351,000,000 |  | $ 406,000,000 | $ 182,000,000 |  |  | $ 270,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 01, 2024 |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.80%
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  | 5.75% | 5.75% |  |  |  |  |  | 5.75%
Former 2022 Notes | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, (percent) |  |  | 102.583% |  |  | 103.875% |  |  |  |  |  |  |  |  |  |  | 103.875% |  |  |  |  |  |  |  |  |
Repayments made on debt |  |  | $ 78,000,000 |  |  | $ 52,000,000 |  |  |  |  |  |  |  |  |  |  | $ 104,000,000 |  |  |  |  |  |  |  |  |
Debt redeemed |  |  | $ 76,000,000 | $ 50,000,000 | $ 50,000,000 | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  | 7.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.125% Senior Notes Due 2023 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds for offering |  |  |  |  |  |  |  |  | $ 295,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 5.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  | 5.125% |  |  |  |  |  |  |  |  |  | 5.125% |  |  |  | 5.125% | 5.125% |  |  |  |  |  |
Senior Notes; Due 2020 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, (percent) |  |  |  |  |  |  |  |  | 104.063% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments made on debt |  |  |  |  |  |  |  |  | $ 302,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt redeemed |  |  |  |  |  |  |  |  | $ 290,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2.00% Convertible Senior Subordinated Notes due 2043 [Member] | Senior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 320,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  | 2.00% | 2.00% |  |  |  |  |  |
Debt instrument conversion rate |  | 27.2221 shares per $1,000 principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt |  | $ 319,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt, net of tax (shares) | shares |  | 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities Due to Make-Whole Premium | shares |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,600,000 |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition We are restricted from paying common stock dividends, prepaying certain senior notes, and repurchasing preferred and common equity unless (1) we are not in default under the terms of the Credit Agreement and (2) the amount of such payments, when added to the aggregate amount of prior restricted payments (as defined in the Credit Agreement) does not exceed $200 million, which amount is subject to increase by a portion of excess cash flows each fiscal year. + References No definition available. + Details
Name: | ehc_CreditAgreementRestriction
Namespace Prefix: | ehc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Max senior secured leverage ratio to permit restricted payments under credit agreement. + References No definition available. + Details
Name: | ehc_DebtInstrumentCovenantLeverageRatioMaximum
Namespace Prefix: | ehc_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum leverage ratio in the financial covenants in the company's credit agreement. + References No definition available. + Details
Name: | ehc_DebtInstrumentCovenantsLeverageRatioMaximum
Namespace Prefix: | ehc_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Par value of debt instrument issued plus or minus a premium or a discount. + References No definition available. + Details
Name: | ehc_DebtInstrumentIssuePricePercentage
Namespace Prefix: | ehc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage owed on principal amount outstanding for amounts drawn under the debt instrument. + References No definition available. + Details
Name: | ehc_DebtInstrumentPeriodicPaymentPercentageofPrincipalOutstanding
Namespace Prefix: | ehc_
Data Type: | num:percentItemType
Balance Type: | na
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X
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