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Description of Business - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of countries in which the entity operates | over 100 countries

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- Definition Description of the number of countries in which the company operates. + References No definition available. + Details
Name: | flut_DescriptionOfTheNumberOfCountriesInWhichTheCompanyOperates
Namespace Prefix: | flut_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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