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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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Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021
Settlement Assets and Obligations |  |  |  |
Losses from chargebacks or fraud that are not credit-related | $ 7.7 | $ 10.0 | $ 14.5 | $ 13.7

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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
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Namespace Prefix: | wu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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