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Flight Equipment held for sale (Details) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 aircraft | Dec. 31, 2018 USD ($) aircraft | Dec. 31, 2019 USD ($)
Flight Equipment Held for Sale |  |  |
Number of aircraft sold or agreed to be sold |  | 6 |
Aircraft Held For Sale |  |  |
Flight Equipment Held for Sale |  |  |
Number of aircraft sold or agreed to be sold |  | 6 |
Flight Equipment, Net | $ |  | $ 241.6 | $ 249.6
Aircraft Held For Sale | Forecast |  |  |
Flight Equipment Held for Sale |  |  |
Number of aircraft sold or agreed to be sold | 8 |  |

X
- 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

X
- 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: |

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |