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Settlement Assets and Obligation - Summary of Investment Securities in Unrealized Position (Details) $ in Millions | Mar. 31, 2024 USD ($) Securities
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State and municipal debt securities |
Summary of Investment Holdings [Line Items] |
Number of securities less than one year | Securities | 67
Fair value less than one year | $ 174.5
Unrealized losses less than one year | $ (1.5)
Number of securities one year or greater | Securities | 260
Fair value one year or greater | $ 559.3
Unrealized losses one year or greater | $ (46.0)
Asset-backed securities |
Summary of Investment Holdings [Line Items] |
Number of securities less than one year | Securities | 8
Fair value less than one year | $ 12.7
Unrealized losses less than one year | $ (0.1)
Corporate debt securities |
Summary of Investment Holdings [Line Items] |
Number of securities one year or greater | Securities | 14
Fair value one year or greater | $ 52.3
Unrealized losses one year or greater | $ (4.3)
United States government agency mortgage-backed securities |
Summary of Investment Holdings [Line Items] |
Number of securities one year or greater | Securities | 10
Fair value one year or greater | $ 9.9
Unrealized losses one year or greater | $ (0.6)

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