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Flight Equipment held for sale (Details) - Aircraft Held For Sale $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 aircraft | Sep. 30, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) aircraft
Flight Equipment Held for Sale |  |  |
Number of aircraft sold or agreed to be sold | aircraft | 6 | 6 | 6
Flight Equipment, Net | $ |  | $ 208.5 | $ 241.6

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- Definition The net amount of long-lived, depreciable flight assets used in the entity's principle business operations, including owned aircraft and on capital lease, as well as capitalized improvements. + References No definition available. + Details
Name: | us-gaap_FlightEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of aircraft sold by the entity during the period. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentNumberOfAircraftSold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=al_AircraftHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |