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Settlement Assets and Obligations - Summary of Investment Securities in Unrealized Position (Details) $ in Millions	Mar. 31, 2025 USD ($) Securities
State and municipal debt securities
Summary of Investment Holdings [Line Items]
Number of securities less than one year | Securities	45
Fair value less than one year	$ 119.0
Unrealized losses less than one year	$ (1.8)
Number of securities one year or greater | Securities	220
Fair value one year or greater	$ 481.2
Unrealized losses one year or greater	$ (29.0)
Corporate debt securities
Summary of Investment Holdings [Line Items]
Number of securities one year or greater | Securities	10
Fair value one year or greater	$ 39.9
Unrealized losses one year or greater	$ (2.5)
United States government agency mortgage-backed securities
Summary of Investment Holdings [Line Items]
Number of securities one year or greater | Securities	8
Fair value one year or greater	$ 5.1
Unrealized losses one year or greater	$ (0.1)

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