v3.26.1
Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Assets:    
Settlement assets $ 3,539.6 $ 3,449.1
Derivatives 20.3 15.3
Liabilities:    
Derivatives 28.4 40.2
Recurring    
Assets:    
Derivatives 20.3 15.3
Total assets 1,524.3 1,504.6
Liabilities:    
Derivatives 28.4 40.2
Total liabilities 28.4 40.2
Recurring | Money market funds    
Assets:    
Settlement assets 57.5 44.2
Recurring | State and municipal debt securities    
Assets:    
Settlement assets 1,110.4 1,131.4
Recurring | Asset-backed securities    
Assets:    
Settlement assets 153.7 157.8
Recurring | Corporate debt securities    
Assets:    
Settlement assets 182.4 155.9
Recurring | Level 1    
Assets:    
Total assets 57.5 44.2
Recurring | Level 1 | Money market funds    
Assets:    
Settlement assets 57.5 44.2
Recurring | Level 2    
Assets:    
Derivatives 20.3 15.3
Total assets 1,466.8 1,460.4
Liabilities:    
Derivatives 28.4 40.2
Total liabilities 28.4 40.2
Recurring | Level 2 | State and municipal debt securities    
Assets:    
Settlement assets 1,110.4 1,131.4
Recurring | Level 2 | Asset-backed securities    
Assets:    
Settlement assets 153.7 157.8
Recurring | Level 2 | Corporate debt securities    
Assets:    
Settlement assets $ 182.4 $ 155.9