v3.26.3
Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Assets:    
Settlement assets $ 3,283.9 $ 3,449.1
Derivatives 26.6 15.3
Liabilities:    
Derivatives 19.1 40.2
Recurring    
Assets:    
Derivatives 26.6 15.3
Total assets 1,337.3 1,504.6
Liabilities:    
Derivatives 19.1 40.2
Total liabilities 19.1 40.2
Recurring | Money market funds    
Assets:    
Settlement assets 20.2 44.2
Recurring | State and municipal debt securities    
Assets:    
Settlement assets 1,018.6 1,131.4
Recurring | Asset-backed securities    
Assets:    
Settlement assets 82.3 157.8
Recurring | Corporate debt securities    
Assets:    
Settlement assets 189.6 155.9
Recurring | Level 1    
Assets:    
Total assets 20.2 44.2
Recurring | Level 1 | Money market funds    
Assets:    
Settlement assets 20.2 44.2
Recurring | Level 2    
Assets:    
Derivatives 26.6 15.3
Total assets 1,317.1 1,460.4
Liabilities:    
Derivatives 19.1 40.2
Total liabilities 19.1 40.2
Recurring | Level 2 | State and municipal debt securities    
Assets:    
Settlement assets 1,018.6 1,131.4
Recurring | Level 2 | Asset-backed securities    
Assets:    
Settlement assets 82.3 157.8
Recurring | Level 2 | Corporate debt securities    
Assets:    
Settlement assets $ 189.6 $ 155.9