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Segments - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 Region Customer
Segments
Utilized to allocate revenue to the country where the transaction is initiated (as a percent)	100.00%
Operating Segments | Consumer Money Transfer
Segments
Number of consumers in money transfer | Customer	2
Number of geographic regions in segment | Region	5

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

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Period Type:	duration

X

- Definition

Number of consumers the company facilitates money transfers between.

+ References

No definition available.

+ Details

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Namespace Prefix:	wu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Definition

Percentage of revenue allocated to the country where the transaction is initiated.

+ References

No definition available.

+ Details

Name:	wu_PercentageOfRevenueAllocatedToCountryWhereTransactionIsInitiated
Namespace Prefix:	wu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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