XML 107 R93.htm IDEA: XBRL DOCUMENT v3.24.0.1

Derivatives - Unrealized Gains/(Losses) (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Gains/(losses) excluded from effectiveness testing recognized in other comprehensive income	$ 2.5	$ (1.8)	$ (2.4)

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

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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