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Settlement Assets and Obligations - Schedule of Settlement Assets and Obligations (Parenthetical) (Details) - Business Solutions [Member] - Asset Held for Sale, Not Discontinued Operations $ in Millions	Dec. 31, 2021 USD ($)
Settlement assets:
Settlement assets held for sale	$ 566.0
Settlement obligations:
Settlement obligations associated with assets held for sale	$ 566.0

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- Definition

Disposal group including discontinued operation settlement liabilities associated with assets held for sale.

+ References

No definition available.

+ Details

Name:	wu_DisposalGroupIncludingDiscontinuedOperationSettlementLiabilitiesAssociatedWithAssetsHeldForSale
Namespace Prefix:	wu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Disposal group including discontinued operations settlement assets associated with assets held for sale.

+ References

No definition available.

+ Details

Name:	wu_DisposalGroupIncludingDiscontinuedOperationsSettlementAssetsAssociatedWithAssetsHeldForSale
Namespace Prefix:	wu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Settlement assets.

+ References

No definition available.

+ Details

Name:	wu_SettlementAssetsAbstract
Namespace Prefix:	wu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Settlement Obligations.

+ References

No definition available.

+ Details

Name:	wu_SettlementObligationsAbstract
Namespace Prefix:	wu_
Data Type:	xbrli:stringItemType
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: