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Derivatives - Unrealized Gains/(Losses) (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative [Line Items]
Gains/(losses) excluded from effectiveness testing recognized in other comprehensive income	$ (0.9)	$ 1.8

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

+ Details

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X

- 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_
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