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v3.23.1

Settlement Assets and Obligations - Summary of Activity in the Allowance for Credit Losses (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |
Losses from chargebacks or fraud that are not credit-related | $ 9.1 | $ 10.0

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- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents losses from chargebacks or fraud associated with transactions initiated through the company's digital channels and not credit-related. + References No definition available. + Details
Name: | wu_FinancingReceivableLossesNotCreditRelated
Namespace Prefix: | wu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration