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Revenue - Disaggregation of Revenue Earned from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Revenue
Revenues from contracts with customers		$ 938.7	$ 995.7
Other revenues	[1]	44.9	53.4
Revenues		983.6	1,049.1
Consumer money transfers
Revenue
Revenues from contracts with customers		846.1	928.6
Other revenues	[1]	26.8	33.4
Revenues		872.9	962.0
Consumer services
Revenue
Revenues from contracts with customers		92.6	67.1
Other revenues	[1]	18.1	20.0
Revenues		110.7	87.1
North America
Revenue
Revenues from contracts with customers		366.2	393.9
North America | Consumer money transfers
Revenue
Revenues from contracts with customers		329.8	354.5
North America | Consumer services
Revenue
Revenues from contracts with customers		36.4	39.4
Europe and CIS
Revenue
Revenues from contracts with customers		240.4	228.9
Europe and CIS | Consumer money transfers
Revenue
Revenues from contracts with customers		230.3	224.4
Europe and CIS | Consumer services
Revenue
Revenues from contracts with customers		10.1	4.5
Middle East, Africa, and South Asia
Revenue
Revenues from contracts with customers		144.9	192.4
Middle East, Africa, and South Asia | Consumer money transfers
Revenue
Revenues from contracts with customers		144.8	192.3
Middle East, Africa, and South Asia | Consumer services
Revenue
Revenues from contracts with customers		0.1	0.1
Latin America and the Caribbean
Revenue
Revenues from contracts with customers		139.9	130.6
Latin America and the Caribbean | Consumer money transfers
Revenue
Revenues from contracts with customers		93.9	107.5
Latin America and the Caribbean | Consumer services
Revenue
Revenues from contracts with customers		46.0	23.1
Asia Pacific
Revenue
Revenues from contracts with customers		47.3	49.9
Asia Pacific | Consumer money transfers
Revenue
Revenues from contracts with customers		$ 47.3	$ 49.9
[1] Includes revenue from investment income generated on settlement assets primarily related to money transfer and money order services, impacts from the Company's foreign currency cash flow hedges, and other sources.

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