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Settlement Assets and Obligations - Summary of Investment Securities in Unrealized Position (Details) $ in Millions	Jun. 30, 2025 USD ($) Securities
State and municipal debt securities
Summary of Investment Holdings [Line Items]
Number of securities less than one year | Securities	113
Fair value less than one year	$ 248.8
Unrealized losses less than one year	$ (4.3)
Number of securities one year or greater | Securities	212
Fair value one year or greater	$ 468.0
Unrealized losses one year or greater	$ (24.9)
Corporate debt securities
Summary of Investment Holdings [Line Items]
Number of securities one year or greater | Securities	8
Fair value one year or greater	$ 33.3
Unrealized losses one year or greater	$ (2.1)
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	$ 4.4
Unrealized losses one year or greater	$ (0.1)

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