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Derivatives - Unrealized Gains/(Losses) (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Foreign Exchange Contract [Member]
Derivative [Line Items]
Gains/(losses) excluded from effectiveness testing recognized in other comprehensive income	$ (4.2)	$ (0.7)

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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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Period Type:	duration

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- Definition

Gain/(Loss) excluded from effectiveness testing recognized in other comprehensive income based on an amortization approach

+ References

No definition available.

+ Details

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Namespace Prefix:	wu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: