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

X

- 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

X

- 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

X

- Details

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

X

- Details

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