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Settlement Assets and Obligation - Summary of Investment Securities in Unrealized Position (Details) $ in Millions	Mar. 31, 2024 USD ($) Securities
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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