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Segments - Narrative (Details) - Operating Segments - Consumer Money Transfer | 3 Months Ended
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Mar. 31, 2024 Customer Region
Segments |
Number of consumers in money transfer | Customer | 2
Number of geographic regions in segment | Region | 5

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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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of consumers the company facilitates money transfers between. + References No definition available. + Details
Name: | wu_NumberOfConsumersInTransaction
Namespace Prefix: | wu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of geographic regions whose functions are limited to generating, managing and maintaining agent relationships and localized marketing activities. + References No definition available. + Details
Name: | wu_NumberOfGeographicRegionsInSegment
Namespace Prefix: | wu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wu_ConsumerMoneyTransferMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |