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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Settlement assets | $ 3,095.7 | $ 2,843.5
Derivatives | 328.2 | 247.7
Liabilities: |  |
Derivatives | 242.3 | 183.8
Recurring |  |
Assets: |  |
Derivatives | 328.2 | 247.7
Total assets | 1,573.7 | 1,654.5
Liabilities: |  |
Derivatives | 242.3 | 183.8
Total liabilities | 242.3 | 183.8
Recurring | Money market funds |  |
Assets: |  |
Settlement assets | 1.8 | 7.9
Recurring | State and municipal debt securities |  |
Assets: |  |
Settlement assets | 1,012.5 | 1,219.9
Recurring | State and municipal variable rate demand notes |  |
Assets: |  |
Settlement assets | 97.5 | 84.8
Recurring | Corporate debt securities |  |
Assets: |  |
Settlement assets | 110.3 |
Recurring | Corporate and other debt securities |  |
Assets: |  |
Settlement assets |  | 57.8
Recurring | United States government agency mortgage-backed securities |  |
Assets: |  |
Settlement assets | 23.4 | 36.4
Recurring | Level 1 |  |
Assets: |  |
Total assets | 1.8 | 7.9
Recurring | Level 1 | Money market funds |  |
Assets: |  |
Settlement assets | 1.8 | 7.9
Recurring | Level 2 |  |
Assets: |  |
Derivatives | 328.2 | 247.7
Total assets | 1,571.9 | 1,646.6
Liabilities: |  |
Derivatives | 242.3 | 183.8
Total liabilities | 242.3 | 183.8
Recurring | Level 2 | State and municipal debt securities |  |
Assets: |  |
Settlement assets | 1,012.5 | 1,219.9
Recurring | Level 2 | State and municipal variable rate demand notes |  |
Assets: |  |
Settlement assets | 97.5 | 84.8
Recurring | Level 2 | Corporate debt securities |  |
Assets: |  |
Settlement assets | 110.3 |
Recurring | Level 2 | Corporate and other debt securities |  |
Assets: |  |
Settlement assets |  | 57.8
Recurring | Level 2 | United States government agency mortgage-backed securities |  |
Assets: |  |
Settlement assets | $ 23.4 | $ 36.4

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