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Settlement Assets and Obligation - Summary of Investment Securities in Unrealized Position (Details) $ in Millions | Sep. 30, 2023 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 | 106
Fair value less than one year | $ 343.0
Unrealized losses less than one year | $ (11.0)
Number of securities one year or greater | Securities | 284
Fair value one year or greater | $ 616.4
Unrealized losses one year or greater | $ (70.5)
Asset-backed securities |
Summary of Investment Holdings [Line Items] |
Number of securities less than one year | Securities | 28
Fair value less than one year | $ 160.7
Unrealized losses less than one year | $ (1.1)
Corporate debt securities |
Summary of Investment Holdings [Line Items] |
Number of securities less than one year | Securities | 18
Fair value less than one year | $ 32.2
Unrealized losses less than one year | $ (0.8)
Number of securities one year or greater | Securities | 22
Fair value one year or greater | $ 99.5
Unrealized losses one year or greater | $ (6.3)
United States government agency mortgage-backed securities |
Summary of Investment Holdings [Line Items] |
Number of securities one year or greater | Securities | 11
Fair value one year or greater | $ 13.0
Unrealized losses one year or greater | $ (1.0)

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