Supplemental Cash Flow information - Summary of Transactions Not Affecting Cash and Cash Equivalents (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Non-cash financing and investing transactions
Addition of fixed assets without monetary outflow	$ 42.7	$ 0.0	$ 0.0
Additions to property, plant and equipment by transfer of aircraft inventories	16.9	0.0	0.0
Write off on Property, plant and equipment by transfer to pool parts inventory	$ 36.4	$ (15.6)	$ (27.2)

The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2024-01-01
-Paragraph 73
-Subparagraph e
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_i&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration