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Settlement Assets and Obligation - Summary of Investment Securities in Unrealized Position (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Securities
State and municipal debt securities  
Summary of Investment Holdings [Line Items]  
Number of securities less than one year | Securities 111
Fair value less than one year $ 296.5
Unrealized losses less than one year $ (5.6)
Number of securities one year or greater | Securities 267
Fair value less than one year $ 609.4
Unrealized losses one year or greater $ (62.5)
Asset-backed securities  
Summary of Investment Holdings [Line Items]  
Number of securities less than one year | Securities 28
Fair value less than one year $ 163.8
Unrealized losses less than one year $ (0.8)
Corporate debt securities  
Summary of Investment Holdings [Line Items]  
Number of securities less than one year | Securities 28
Fair value less than one year $ 84.3
Unrealized losses less than one year $ (1.3)
Number of securities one year or greater | Securities 11
Fair value less than one year $ 40.5
Unrealized losses one year or greater $ (5.2)
United States government agency mortgage-backed securities  
Summary of Investment Holdings [Line Items]  
Number of securities less than one year | Securities 6
Fair value less than one year $ 5.2
Unrealized losses less than one year $ (0.2)
Number of securities one year or greater | Securities 7
Fair value less than one year $ 10.7
Unrealized losses one year or greater $ (0.6)