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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 ($)
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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

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- 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

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- Definition Settlement assets. + References No definition available. + Details
Name: | wu_SettlementAssetsAbstract
Namespace Prefix: | wu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Settlement Obligations. + References No definition available. + Details
Name: | wu_SettlementObligationsAbstract
Namespace Prefix: | wu_
Data Type: | xbrli:stringItemType
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: |