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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Cash and cash equivalents |  |  |  |
Amortized Cost |  | $ 947.8 | $ 1,474.0 | $ 1,097.6
Available-for-sale securities: |  |  |  |
Fair Value |  | 1,449.4 |  |
Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 1,450.8 | 1,372.9 |
Fair Value |  | 1,449.4 | 1,332.3 |
Gross Unrealized Gains |  | 21.8 | 6.1 |
Gross Unrealized Losses |  | (23.2) | (46.7) |
Net Unrealized Gains/ (Losses) |  | (1.4) | (40.6) |
Amortized Cost |  | 1,478.9 | 1,405.5 |
Fair Value |  | 1,477.5 | 1,364.9 |
Gross Unrealized Gains |  | 21.8 | 6.1 |
Gross Unrealized Losses |  | (23.2) | (46.7) |
Net Unrealized Gains/ (Losses) |  | (1.4) | (40.6) |
Money market funds | Settlement Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Amortized Cost |  | 28.1 | 32.6 |
Fair Value |  | 28.1 | 32.6 |
State and municipal debt securities | Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost | [1] | 1,131.7 | 1,069.5 |
Fair Value | [1] | 1,123.0 | 1,029.0 |
Gross Unrealized Gains | [1] | 12.6 | 2.7 |
Gross Unrealized Losses | [1] | (21.3) | (43.2) |
Net Unrealized Gains/ (Losses) | [1] | (8.7) | (40.5) |
Asset-backed securities | Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 167.1 | 208.6 |
Fair Value |  | 170.0 | 211.2 |
Gross Unrealized Gains |  | 2.9 | 2.6 |
Net Unrealized Gains/ (Losses) |  | 2.9 | 2.6 |
Corporate debt securities | Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 147.6 | 87.5 |
Fair Value |  | 152.1 | 85.0 |
Gross Unrealized Gains |  | 6.3 | 0.8 |
Gross Unrealized Losses |  | (1.8) | (3.3) |
Net Unrealized Gains/ (Losses) |  | 4.5 | (2.5) |
United States government agency mortgage-backed securities | Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 4.4 | 7.3 |
Fair Value |  | 4.3 | 7.1 |
Gross Unrealized Losses |  | (0.1) | (0.2) |
Net Unrealized Gains/ (Losses) |  | $ (0.1) | $ (0.2) |
[1] | The majority of these securities are fixed-rate instruments.

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