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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Cash and cash equivalents |  |  |  |
Amortized Cost |  | $ 1,228.6 | $ 1,285.9 | $ 1,295.8
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 1,497.2 | 1,417.8 |
Fair Value |  | 1,437.3 | 1,333.7 |
Gross Unrealized Gains |  | 6.2 | 1.4 |
Gross Unrealized Losses |  | (66.1) | (85.5) |
Net Unrealized Gains/ (Losses) |  | (59.9) | (84.1) |
Amortized Cost |  | 1,673.0 | 1,429.5 |
Fair Value |  | 1,613.1 | 1,345.4 |
Gross Unrealized Gains |  | 6.2 | 1.4 |
Gross Unrealized Losses |  | (66.1) | (85.5) |
Net Unrealized Gains/ (Losses) |  | (59.9) | (84.1) |
Money market funds |  |  |  |
Cash and cash equivalents |  |  |  |
Amortized Cost |  | 150.0 |  |
Fair Value |  | 150.0 |  |
Money market funds | Settlement Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Amortized Cost |  | 25.8 | 11.7 |
Fair Value |  | 25.8 | 11.7 |
State and municipal debt securities |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost | [1] | 1,066.7 | 1,010.5 |
Fair Value | [1] | 1,010.3 | 933.3 |
Gross Unrealized Gains | [1] | 3.0 | 0.3 |
Gross Unrealized Losses | [1] | (59.4) | (77.5) |
Net Unrealized Gains/ (Losses) | [1] | (56.4) | (77.2) |
Asset-backed securities |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 193.9 | 183.4 |
Fair Value |  | 196.4 | 184.1 |
Gross Unrealized Gains |  | 2.6 | 0.8 |
Gross Unrealized Losses |  | (0.1) | (0.1) |
Net Unrealized Gains/ (Losses) |  | 2.5 | 0.7 |
Corporate debt securities |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 153.0 | 153.5 |
Fair Value |  | 147.7 | 146.9 |
Gross Unrealized Gains |  | 0.6 | 0.3 |
Gross Unrealized Losses |  | (5.9) | (6.9) |
Net Unrealized Gains/ (Losses) |  | (5.3) | (6.6) |
State and municipal variable-rate demand notes |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 64.1 | 48.9 |
Fair Value |  | 64.1 | 48.9 |
United States government agency mortgage-backed securities |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 19.5 | 21.5 |
Fair Value |  | 18.8 | 20.5 |
Gross Unrealized Losses |  | (0.7) | (1.0) |
Net Unrealized Gains/ (Losses) |  | $ (0.7) | $ (1.0) |
[1] | The majority of these securities are fixed-rate instruments.

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