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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
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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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