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Long-term Debt - Textual (Details) |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jan. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Apr. 30, 2021 USD ($) | Nov. 30, 2020 USD ($) | May 31, 2020 USD ($) | Nov. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2015 USD ($) | Jan. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Feb. 28, 2022 USD ($) | Dec. 09, 2021 USD ($) | Sep. 30, 2021 | Mar. 31, 2021 | Oct. 31, 2020 USD ($) | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 USD ($) | Sep. 30, 2015 USD ($) | Aug. 31, 2015 USD ($) | Jan. 31, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 2,300,000 | $ 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  | 6.00 |  |  |  |  |  |  |  |  | 5.00 | 6.50 |  |  |  | 5.50 | 6.50 |  | 5.50 | 4.75 | 4.50 |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  |  | 4.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, reduction in capacity under restricted payments builder basket |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, (percent) |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  |  | $ 583,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.5 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment agreement, amount to be paid |  |  |  |  |  |  |  |  | $ 40,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding under letter of credit facility |  |  |  |  |  |  |  |  |  |  | $ 38,200,000 | 36,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (percent) |  |  |  |  |  | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio maximum |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment limit under the credit agreement's negative covenant |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Fed Funds Effective Rate Overnight Index Swap Rate | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate (percent) |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | LIBOR | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate (percent) |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 270,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate principal amount outstanding (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable interest rate under credit facility (percent) |  |  |  |  |  |  |  |  |  |  | 2.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 260,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.125% Senior Notes due 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  | $ 99,600,000 | $ 298,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt redeemed |  | $ 100,000,000 | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  | 5.125% |  |  | 5.125% | 5.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds for offering |  |  |  |  |  |  |  | $ 295,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  | 5.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.125% Senior Notes due 2023 | Senior Notes | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.125% Senior Notes due 2023 | Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes; 05.75%; Due 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, (percent) |  |  |  |  |  | 100.958% | 101.917% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 | $ 400,000,000 | $ 175,000,000 | $ 275,000,000
Debt redeemed |  |  |  |  |  | $ 400,000,000 | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75%
Effective interest rate (percent) |  |  |  | 5.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issue price as percentage of principal (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.50% | 102.00% | 103.625% |
Repayments of debt |  |  |  | $ 300,000,000 |  | $ 404,000,000 | $ 102,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.75% Senior Notes due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  | $ 347,000,000.0 | $ 346,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 5.75% | 5.75% |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |
4.50% Senior Notes due 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  | $ 786,800,000 | $ 785,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 4.50% | 4.50% |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.80% |  |  |  |  |
Issuance of face value (percent) |  |  |  |  | 99.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.75% Senior Notes due 2030 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  | $ 784,700,000 | $ 783,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 4.75% | 4.75% |  |  |  |  |  |  |  |  |  | 4.75% |  |  |  |  |
Effective interest rate (percent) |  |  |  |  | 5.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of face value (percent) |  |  |  |  | 98.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.625% Senior Notes due 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  | $ 393,700,000 | $ 393,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 4.625% | 4.625% |  |  |  |  |  | 4.625% |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.80% |  |  |  |  |  |  |  |  |

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- 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
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- Definition Debt Instrument, Amendment Agreement, Amount To Be Paid + References No definition available. + Details
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Namespace Prefix: | ehc_
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- Definition Debt Instrument, Covenant, Leverage Ratio + References No definition available. + Details
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Namespace Prefix: | ehc_
Data Type: | xbrli:pureItemType
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- Definition Max senior secured leverage ratio to permit restricted payments under credit agreement. + References No definition available. + Details
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Namespace Prefix: | ehc_
Data Type: | xbrli:pureItemType
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- Definition Debt Instrument, Discount Rate at Issuance of Face Value + References No definition available. + Details
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Namespace Prefix: | ehc_
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- Definition Par value of debt instrument issued plus or minus a premium or a discount. + References No definition available. + Details
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Namespace Prefix: | ehc_
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- Definition Percentage owed on principal amount outstanding for amounts drawn under the debt instrument. + References No definition available. + Details
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- Definition Debt Instrument, Reduction In Capacity Under Restricted Payments Builder Basket + References No definition available. + Details
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Namespace Prefix: | ehc_
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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