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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Settlement assets $ 3,267.5 $ 3,360.8
Derivatives 12.7 29.5
Liabilities:    
Derivatives 43.2 3.6
Recurring    
Assets:    
Derivatives 12.7 29.5
Total assets 1,490.2 1,394.4
Liabilities:    
Derivatives 43.2 3.6
Total liabilities 43.2 3.6
Recurring | Money market funds    
Assets:    
Settlement assets 28.1 32.6
Recurring | State and municipal debt securities    
Assets:    
Settlement assets 1,123.0 1,029.0
Recurring | Asset-backed securities    
Assets:    
Settlement assets 170.0 211.2
Recurring | Corporate debt securities    
Assets:    
Settlement assets 152.1 85.0
Recurring | United States government agency mortgage-backed securities    
Assets:    
Settlement assets 4.3 7.1
Recurring | Level 1    
Assets:    
Total assets 28.1 32.6
Recurring | Level 1 | Money market funds    
Assets:    
Settlement assets 28.1 32.6
Recurring | Level 2    
Assets:    
Derivatives 12.7 29.5
Total assets 1,462.1 1,361.8
Liabilities:    
Derivatives 43.2 3.6
Total liabilities 43.2 3.6
Recurring | Level 2 | State and municipal debt securities    
Assets:    
Settlement assets 1,123.0 1,029.0
Recurring | Level 2 | Asset-backed securities    
Assets:    
Settlement assets 170.0 211.2
Recurring | Level 2 | Corporate debt securities    
Assets:    
Settlement assets 152.1 85.0
Recurring | Level 2 | United States government agency mortgage-backed securities    
Assets:    
Settlement assets $ 4.3 $ 7.1