v3.26.3
Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Cash and cash equivalents      
Amortized Cost $ 1,098.0 $ 1,234.4 $ 947.8
Available-for-sale securities:      
Amortized Cost 1,351.7 1,443.9  
Fair Value 1,290.5 1,445.1  
Gross Unrealized Gains 0.6 21.0  
Gross Unrealized Losses (61.8) (19.8)  
Net Unrealized Gains/ (Losses) (61.2) 1.2  
Amortized Cost 1,371.9 1,488.1  
Fair Value 1,310.7 1,489.3  
Gross Unrealized Gains 0.6 21.0  
Gross Unrealized Losses (61.8) (19.8)  
Net Unrealized Gains/ (Losses) (61.2) 1.2  
Money market funds      
Cash and cash equivalents      
Amortized Cost 20.2 44.2  
Fair Value 20.2 44.2  
State and municipal debt securities      
Available-for-sale securities:      
Amortized Cost [1] 1,072.2 1,137.2  
Fair Value [1] 1,018.6 1,131.4  
Gross Unrealized Gains [1] 0.2 12.5  
Gross Unrealized Losses [1] (53.8) (18.3)  
Net Unrealized Gains/ (Losses) [1] (53.6) (5.8)  
Asset-backed securities      
Available-for-sale securities:      
Amortized Cost 82.0 155.4  
Fair Value 82.3 157.8  
Gross Unrealized Gains 0.3 2.4  
Net Unrealized Gains/ (Losses) 0.3 2.4  
Corporate debt and other securities      
Available-for-sale securities:      
Amortized Cost 197.5 151.3  
Fair Value 189.6 155.9  
Gross Unrealized Gains 0.1 6.1  
Gross Unrealized Losses (8.0) (1.5)  
Net Unrealized Gains/ (Losses) $ (7.9) $ 4.6  
[1] The majority of these securities are fixed-rate instruments.