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Earnings per Common Share - Schedule of Warrant Activity (Details) - $ / shares shares in Millions	1 Months Ended
	Jan. 17, 2017	Dec. 31, 2016	Sep. 30, 2009
Warrants and Rights Note Disclosure Roll Forward [Abstract]
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
Warrants and Rights Note Disclosure Roll Forward [Abstract]
Exercised	(6.5)
Weighted average exercise price (in dollars per share)	$ 41.40
Cash exercise
Warrants and Rights Note Disclosure Roll Forward [Abstract]
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

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Namespace Prefix:	ehc_
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Balance Type:	na
Period Type:	duration

X

- Definition

Warrants and Rights Note Disclosure Roll Forward [Abstract]

+ References

No definition available.

+ Details

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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

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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

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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

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