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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets:    
Settlement assets $ 3,687.0 $ 3,486.8
Derivatives 10.8 126.1
Liabilities:    
Derivatives 17.4 98.9
Recurring    
Assets:    
Derivatives 10.8 126.1
Total assets 1,480.8 1,471.5
Liabilities:    
Derivatives 17.4 98.9
Total liabilities 17.4 98.9
Recurring | Money market funds    
Assets:    
Settlement assets 11.8 11.7
Recurring | State and municipal debt securities    
Assets:    
Settlement assets 1,011.4 933.3
Recurring | Asset-backed securities    
Assets:    
Settlement assets 195.7 184.1
Recurring | Corporate debt securities    
Assets:    
Settlement assets 152.2 146.9
Recurring | State and municipal variable rate demand notes    
Assets:    
Settlement assets 86.8 48.9
Recurring | United States government agency mortgage-backed securities    
Assets:    
Settlement assets 12.1 20.5
Recurring | Level 1    
Assets:    
Total assets 11.8 11.7
Recurring | Level 1 | Money market funds    
Assets:    
Settlement assets 11.8 11.7
Recurring | Level 2    
Assets:    
Derivatives 10.8 126.1
Total assets 1,469.0 1,459.8
Liabilities:    
Derivatives 17.4 98.9
Total liabilities 17.4 98.9
Recurring | Level 2 | State and municipal debt securities    
Assets:    
Settlement assets 1,011.4 933.3
Recurring | Level 2 | Asset-backed securities    
Assets:    
Settlement assets 195.7 184.1
Recurring | Level 2 | Corporate debt securities    
Assets:    
Settlement assets 152.2 146.9
Recurring | Level 2 | State and municipal variable rate demand notes    
Assets:    
Settlement assets 86.8 48.9
Recurring | Level 2 | United States government agency mortgage-backed securities    
Assets:    
Settlement assets $ 12.1 $ 20.5