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Settlement Assets and Obligation - Summary of Investment Securities in Unrealized Position (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Securities
State and municipal debt securities  
Summary of Investment Holdings [Line Items]  
Number of securities less than one year | Securities 100
Fair value less than one year $ 238.6
Unrealized losses less than one year $ (5.6)
Number of securities one year or greater | Securities 252
Fair value less than one year $ 585.4
Unrealized losses one year or greater $ (53.7)
Asset-backed securities  
Summary of Investment Holdings [Line Items]  
Number of securities less than one year | Securities 2
Fair value less than one year $ 6.4
Unrealized losses less than one year $ (0.1)
Corporate debt securities  
Summary of Investment Holdings [Line Items]  
Number of securities less than one year | Securities 25
Fair value less than one year $ 82.6
Unrealized losses less than one year $ (1.0)
Number of securities one year or greater | Securities 11
Fair value less than one year $ 40.9
Unrealized losses one year or greater $ (5.0)
United States government agency mortgage-backed securities  
Summary of Investment Holdings [Line Items]  
Number of securities less than one year | Securities 9
Fair value less than one year $ 12.6
Unrealized losses less than one year $ (0.5)
Number of securities one year or greater | Securities 4
Fair value less than one year $ 6.1
Unrealized losses one year or greater $ (0.2)