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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Assets:    
Settlement assets $ 3,388.1 $ 3,360.8
Derivatives 9.3 29.5
Liabilities:    
Derivatives 56.7 3.6
Recurring    
Assets:    
Derivatives 9.3 29.5
Total assets 1,499.3 1,394.4
Liabilities:    
Derivatives 56.7 3.6
Total liabilities 56.7 3.6
Recurring | Money market funds    
Assets:    
Settlement assets 33.3 32.6
Recurring | State and municipal debt securities    
Assets:    
Settlement assets 1,103.1 1,029.0
Recurring | Asset-backed securities    
Assets:    
Settlement assets 196.5 211.2
Recurring | Corporate debt securities    
Assets:    
Settlement assets 151.6 85.0
Recurring | United States government agency mortgage-backed securities    
Assets:    
Settlement assets 5.5 7.1
Recurring | Level 1    
Assets:    
Total assets 33.3 32.6
Recurring | Level 1 | Money market funds    
Assets:    
Settlement assets 33.3 32.6
Recurring | Level 2    
Assets:    
Derivatives 9.3 29.5
Total assets 1,466.0 1,361.8
Liabilities:    
Derivatives 56.7 3.6
Total liabilities 56.7 3.6
Recurring | Level 2 | State and municipal debt securities    
Assets:    
Settlement assets 1,103.1 1,029.0
Recurring | Level 2 | Asset-backed securities    
Assets:    
Settlement assets 196.5 211.2
Recurring | Level 2 | Corporate debt securities    
Assets:    
Settlement assets 151.6 85.0
Recurring | Level 2 | United States government agency mortgage-backed securities    
Assets:    
Settlement assets $ 5.5 $ 7.1