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Inventories - Summary of Loss Due to Reduction in Market Value (Detail) - Aircraft [member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Loss Due To Reduction In Market Value [Line Items]
Beginning balance	$ (1.4)	$ (5.7)	$ (1.0)
Additions	0.0	(0.6)	(5.9)
Disposals	0.1	0.0	1.2
Reversals	0.4	4.9	0.0
Ending balance	$ (0.9)	$ (1.4)	$ (5.7)