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Settlement Assets and Obligations - Schedule of Settlement Assets and Obligations (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
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Settlement assets: |  |  |
Cash and cash equivalents | $ 412.4 | $ 496.0 | $ 737.1
Receivables from agents and others | 1,832.2 | 1,748.3 |
Less: Allowance for credit losses | (11.9) | (15.4) |
Receivables from agents and others, net | 1,820.3 | 1,732.9 |
Investment securities | 1,403.0 | 1,458.2 |
Less: Allowance for credit losses | (0.1) | (0.1) |
Investment securities, net | 1,402.9 | 1,458.1 |
Total settlement assets | 3,635.6 | 3,687.0 |
Settlement obligations: |  |  |
Money transfer, money order, and payment service payables | 2,940.7 | 2,764.5 |
Payables to agents | 694.9 | 922.5 |
Total settlement obligations | $ 3,635.6 | $ 3,687.0 |

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