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Settlement Assets and Obligations - Schedule of Settlement Assets and Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Settlement assets:
Cash and cash equivalents	$ 424.8	$ 631.6	$ 327.2
Receivables from agents and others	1,410.0	1,421.7
Less: Allowance for credit losses	(16.7)	(24.7)
Receivables from agents and others, net	1,393.3	1,397.0
Investment securities	1,449.4	1,332.3
Less: Allowance for credit losses		(0.1)
Investment securities, net	1,449.4	1,332.2
Total settlement assets	3,267.5	3,360.8
Settlement obligations:
Money transfer, money order, and payment service payables	2,558.9	2,655.5
Payables to agents	708.6	705.3
Total settlement obligations	$ 3,267.5	$ 3,360.8

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