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Settlement Assets and Obligation - Summary of Investment Securities in Unrealized Position (Details) $ in Millions	Jun. 30, 2024 USD ($) Securities
State and municipal debt securities
Summary of Investment Holdings [Line Items]
Number of securities less than one year | Securities	126
Fair value less than one year	$ 248.1
Unrealized losses less than one year	$ (2.2)
Number of securities one year or greater | Securities	255
Fair value one year or greater	$ 544.3
Unrealized losses one year or greater	$ (45.2)
Asset-backed securities
Summary of Investment Holdings [Line Items]
Number of securities less than one year | Securities	12
Fair value less than one year	$ 25.0
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	13
Fair value one year or greater	$ 49.4
Unrealized losses one year or greater	$ (4.1)
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	$ 8.6
Unrealized losses one year or greater	$ (0.4)

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