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Fair Value Measurement - Additional Information (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Fair Value Disclosures [Abstract] |  |
Fair value, assets, Level 1 to Level 2 transfers, amount | $ 0 | $ 0
Fair value, assets, Level 2 to Level 1 transfers, amount | 0 | 0
Fair value, liabilities, Level 1 to Level 2 transfers, amount | 0 | 0
Fair value, liabilities, Level 2 to Level 1 transfers, amount | 0 | 0
Fair value, measurement with unobservable inputs reconciliation, liability, transfers into Level 3 | 0 | 0
Fair Value, measurement with unobservable inputs reconciliation, liability, transfers out of Level 3 | $ 0 | $ 0

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- Definition Fair value asset level1 to level2 transfers amount. + References No definition available. + Details
Name: | alit_FairValueAssetLevel1ToLevel2TransfersAmount
Namespace Prefix: | alit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value asset level 2 to level 1 transfers amount. + References No definition available. + Details
Name: | alit_FairValueAssetLevel2ToLevel1TransfersAmount
Namespace Prefix: | alit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value liabilities level 2 to level 1 transfer amount. + References No definition available. + Details
Name: | alit_FairValueLiabilitiesLevel2ToLevel1TransferAmount
Namespace Prefix: | alit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value liabilities transfers amount Level1 to Level2 + References No definition available. + Details
Name: | alit_FairValueLiabilitiesTransfersAmountLevel1ToLevel2
Namespace Prefix: | alit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration