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Settlement Assets and Obligation - Summary of Investment Securities in Unrealized Position (Details) $ in Millions	Sep. 30, 2023 USD ($) Securities
State and municipal debt securities
Summary of Investment Holdings [Line Items]
Number of securities less than one year | Securities	106
Fair value less than one year	$ 343.0
Unrealized losses less than one year	$ (11.0)
Number of securities one year or greater | Securities	284
Fair value one year or greater	$ 616.4
Unrealized losses one year or greater	$ (70.5)
Asset-backed securities
Summary of Investment Holdings [Line Items]
Number of securities less than one year | Securities	28
Fair value less than one year	$ 160.7
Unrealized losses less than one year	$ (1.1)
Corporate debt securities
Summary of Investment Holdings [Line Items]
Number of securities less than one year | Securities	18
Fair value less than one year	$ 32.2
Unrealized losses less than one year	$ (0.8)
Number of securities one year or greater | Securities	22
Fair value one year or greater	$ 99.5
Unrealized losses one year or greater	$ (6.3)
United States government agency mortgage-backed securities
Summary of Investment Holdings [Line Items]
Number of securities one year or greater | Securities	11
Fair value one year or greater	$ 13.0
Unrealized losses one year or greater	$ (1.0)

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