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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Settlement assets | $ 2,843.5 | $ 3,821.4
Derivatives | 247.7 | 453.3
Liabilities: |  |
Derivatives | 183.8 | 430.3
Recurring |  |
Assets: |  |
Derivatives | 247.7 | 453.3
Total assets | 1,654.5 | 2,457.0
Liabilities: |  |
Derivatives | 183.8 | 430.3
Total liabilities | 183.8 | 430.3
Recurring | Money market funds |  |
Assets: |  |
Settlement assets | 7.9 | 13.1
Recurring | State and municipal debt securities |  |
Assets: |  |
Settlement assets | 1,219.9 | 1,303.9
Recurring | State and municipal variable rate demand notes |  |
Assets: |  |
Settlement assets | 84.8 | 562.1
Recurring | United States government agency mortgage-backed securities |  |
Assets: |  |
Settlement assets | 36.4 | 51.8
Recurring | Corporate and other debt securities |  |
Assets: |  |
Settlement assets | 57.8 | 72.8
Recurring | Level 1 |  |
Assets: |  |
Total assets | 7.9 | 13.1
Recurring | Level 1 | Money market funds |  |
Assets: |  |
Settlement assets | 7.9 | 13.1
Recurring | Level 2 |  |
Assets: |  |
Derivatives | 247.7 | 453.3
Total assets | 1,646.6 | 2,443.9
Liabilities: |  |
Derivatives | 183.8 | 430.3
Total liabilities | 183.8 | 430.3
Recurring | Level 2 | State and municipal debt securities |  |
Assets: |  |
Settlement assets | 1,219.9 | 1,303.9
Recurring | Level 2 | State and municipal variable rate demand notes |  |
Assets: |  |
Settlement assets | 84.8 | 562.1
Recurring | Level 2 | United States government agency mortgage-backed securities |  |
Assets: |  |
Settlement assets | 36.4 | 51.8
Recurring | Level 2 | Corporate and other debt securities |  |
Assets: |  |
Settlement assets | $ 57.8 | $ 72.8

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