XML 48 R37.htm IDEA: XBRL DOCUMENT v3.26.1

PREPAYMENTS, OTHER RECEIVABLES AND OTHER ASSETS (Details) - Prepayments Other Receivable and Other Assets - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Disclosure Of Prepayments Other Receivables And Other Assets [Line Items]
Other collaboration receivables	$ 174.0	$ 227.8
VAT recoverable	10.9	8.1
Prepayments	19.4	14.6
Other current assets	5.0	2.9
Total	$ 209.3	$ 253.4

X

- Definition

The amount of current assets that the entity does not separately disclose in the same statement or note. [Refer: Current assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_OtherCurrentAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Receivables that represent amounts paid for goods and services before they have been delivered.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph B9
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B9_b&doctype=Appendix&subtype=B
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 78
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_78_b&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_Prepayments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of receivables related to a value added tax.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 78
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_78_b&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ValueAddedTaxReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Disclosure of prepayments, other receivables and other assets.

+ References

No definition available.

+ Details

Name:	legn_DisclosureOfPrepaymentsOtherReceivablesAndOtherAssetsLineItems
Namespace Prefix:	legn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Other Collaboration Receivables

+ References

No definition available.

+ Details

Name:	legn_OtherCollaborationReceivables
Namespace Prefix:	legn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Prepayments, other receivables and other assets.

+ References

No definition available.

+ Details

Name:	legn_PrepaymentsOtherReceivablesAndOtherAssets
Namespace Prefix:	legn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=legn_PrepaymentsOtherReceivablesAndOtherAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: