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v3.23.1

Accounting Policies and Practices - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2023
Accounting Policies And Practices [Line Items] |
Business combination tax receivable agreement percentage of benefit deemed to realize | 85.00%

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- Definition Accounting policies and practices. + References No definition available. + Details
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Namespace Prefix: | alit_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Business combination tax receivable agreement percentage of benefit deemed to realize. + References No definition available. + Details
Name: | alit_BusinessCombinationTaxReceivableAgreementPercentageOfBenefitDeemedToRealize
Namespace Prefix: | alit_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration