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Settlement Assets and Obligations - Summary of Activity in the Allowance for Credit Losses (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Settlement Assets and Obligations |  |
Losses from chargebacks or fraud that are not credit-related | $ 51.4 | $ 41.3

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- References No definition available. + Details
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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_
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