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Revenue - Disaggregation of Revenue Earned from Contracts with Customers (Parenthetical) (Details) - Item |  | 9 Months Ended
--- | --- | ---
Aug. 04, 2021 | Sep. 30, 2022
Asset Held for Sale, Not Discontinued Operations | Business Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Number of closings | 3 | 3

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of closing included in the divestiture agreement. + References No definition available. + Details
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Namespace Prefix: | wu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wu_BusinessSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |