Commitments and Contingencies - Narrative (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021	Oct. 16, 2020
Commitments and Contingencies Disclosure [Abstract]
Percent of TEUs issued involved in lawsuit			5.00%
Liabilities related to litigation	$ 0	$ 0
Operating lease, lease not yet commenced liability	$ 378,000,000
Lessee, operating lease, lease not yet commenced, term of contract	25 years
New corporate headquarters, estimated total incentive to be funded by TIF	$ 64,000,000
Tax Incremental Financing, commitment amount		$ 64,000,000
Refund within next three months	$ 15,000,000

Lessee, Operating Lease, Lease Not Yet Commenced, Liability, To Be Paid

No definition available.

Name:	elan_LesseeOperatingLeaseLeaseNotYetCommencedLiabilityToBePaid
Namespace Prefix:	elan_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Loss Contingency, Percent of TEUs Issued Involved in Lawsuit

+ References

No definition available.

+ Details

Name:	elan_LossContingencyPercentOfTEUsIssuedInvolvedInLawsuit
Namespace Prefix:	elan_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Tax Incremental Financing, Commitment Amount

+ References

No definition available.

+ Details

Name:	elan_TaxIncrementalFinancingCommitmentAmount
Namespace Prefix:	elan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Tax Incremental Financing, Estimated Total Incentive To Be Funded

+ References

No definition available.

+ Details

Name:	elan_TaxIncrementalFinancingEstimatedTotalIncentiveToBeFunded
Namespace Prefix:	elan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Tax Incremental Financing, Expect To Refund Within Next Three Months

+ References

No definition available.

+ Details

Name:	elan_TaxIncrementalFinancingExpectToRefundWithinNextThreeMonths
Namespace Prefix:	elan_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LitigationReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant