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Rental Income - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Leases [Abstract] |  |
Maintenance reserve revenue | $ 80.4 | $ 167.3

X
- Definition Lessor, Operating Lease, Maintenance Reserve Revenue + References No definition available. + Details
Name: | al_LessorOperatingLeaseMaintenanceReserveRevenue
Namespace Prefix: | al_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration