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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Cash and cash equivalents |  |  |  |
Amortized Cost |  | $ 1,289.0 | $ 1,474.0 | $ 1,106.5
Available-for-sale securities: |  |  |  |
Fair Value |  | 1,440.5 |  |
Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 1,460.2 | 1,372.9 |
Fair Value |  | 1,440.5 | 1,332.3 |
Gross Unrealized Gains |  | 13.7 | 6.1 |
Gross Unrealized Losses |  | (33.4) | (46.7) |
Net Unrealized Gains/ (Losses) |  | (19.7) | (40.6) |
Amortized Cost |  | 1,480.4 | 1,405.5 |
Fair Value |  | 1,460.7 | 1,364.9 |
Gross Unrealized Gains |  | 13.7 | 6.1 |
Gross Unrealized Losses |  | (33.4) | (46.7) |
Net Unrealized Gains/ (Losses) |  | (19.7) | (40.6) |
Money market funds | Settlement Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Amortized Cost |  | 20.2 | 32.6 |
Fair Value |  | 20.2 | 32.6 |
State and municipal debt securities | Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost | [1] | 1,090.7 | 1,068.1 |
Fair Value | [1] | 1,067.0 | 1,027.6 |
Gross Unrealized Gains | [1] | 7.1 | 2.7 |
Gross Unrealized Losses | [1] | (30.8) | (43.2) |
Net Unrealized Gains/ (Losses) | [1] | (23.7) | (40.5) |
Asset-backed securities | Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 205.7 | 208.6 |
Fair Value |  | 208.6 | 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 |  | 156.0 | 87.5 |
Fair Value |  | 157.2 | 85.0 |
Gross Unrealized Gains |  | 3.7 | 0.8 |
Gross Unrealized Losses |  | (2.5) | (3.3) |
Net Unrealized Gains/ (Losses) |  | 1.2 | (2.5) |
State and municipal variable-rate demand notes | Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 1.4 | 1.4 |
Fair Value |  | 1.4 | 1.4 |
United States government agency mortgage-backed securities | Settlement Assets |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost |  | 6.4 | 7.3 |
Fair Value |  | 6.3 | 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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