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Settlement Assets and Obligation - Summary of Investment Securities in Unrealized Position (Details) $ in Millions | Mar. 31, 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 | 100
Fair value less than one year | $ 238.6
Unrealized losses less than one year | $ (5.6)
Number of securities one year or greater | Securities | 252
Fair value less than one year | $ 585.4
Unrealized losses one year or greater | $ (53.7)
Asset-backed securities |
Summary of Investment Holdings [Line Items] |
Number of securities less than one year | Securities | 2
Fair value less than one year | $ 6.4
Unrealized losses less than one year | $ (0.1)
Corporate debt securities |
Summary of Investment Holdings [Line Items] |
Number of securities less than one year | Securities | 25
Fair value less than one year | $ 82.6
Unrealized losses less than one year | $ (1.0)
Number of securities one year or greater | Securities | 11
Fair value less than one year | $ 40.9
Unrealized losses one year or greater | $ (5.0)
United States government agency mortgage-backed securities |
Summary of Investment Holdings [Line Items] |
Number of securities less than one year | Securities | 9
Fair value less than one year | $ 12.6
Unrealized losses less than one year | $ (0.5)
Number of securities one year or greater | Securities | 4
Fair value less than one year | $ 6.1
Unrealized losses one year or greater | $ (0.2)

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