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Settlement Assets and Obligations - Schedule of Settlement Assets and Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Settlement assets: |  |  |
Cash and cash equivalents | $ 835.5 | $ 695.7 | $ 368.2
Receivables from agents, Business Solutions customers, and others | 1,198.8 | 1,188.3 |
Less: Allowance for credit losses | (23.7) | (53.2) |
Receivables from agents, Business Solutions customers, and others, net | 1,175.1 | 1,135.1 |
Investment securities | 1,398.9 | 1,990.6 |
Total settlement assets | 3,409.5 |  |
Total settlement assets | 2,843.5 | 3,821.4 |
Settlement obligations: |  |  |
Money transfer, money order, and payment service payables | 2,838.9 | 2,902.9 |
Payables to agents | 570.6 | 918.5 |
Total settlement obligations | 3,409.5 |  |
Total settlement obligations | $ 2,843.5 | $ 3,821.4 |

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