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Segments - Segments Results (Parenthetical) (Details) | Aug. 04, 2021 Item
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Business Solutions | Asset Held for Sale, Not Discontinued Operations |
Segment Reporting Information [Line Items] |
Number of closings | 2

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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 Represents the number of closing included in the divestiture agreement. + References No definition available. + Details
Name: | wu_DisposalGroupIncludingDiscontinuedOperationNumberOfClosingInTransaction
Namespace Prefix: | wu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |