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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Assets:      
Settlement assets $ 3,386.8 $ 3,486.8  
Cash and cash equivalents 1,228.6 1,285.9 $ 1,295.8
Derivatives 102.2 126.1  
Liabilities:      
Derivatives 84.0 98.9  
Money market funds      
Assets:      
Cash and cash equivalents 150.0    
Recurring      
Assets:      
Derivatives 102.2 126.1  
Total assets 1,715.3 1,471.5  
Liabilities:      
Derivatives 84.0 98.9  
Total liabilities 84.0 98.9  
Recurring | Money market funds      
Assets:      
Settlement assets 25.8 11.7  
Cash and cash equivalents 150.0    
Recurring | State and municipal debt securities      
Assets:      
Settlement assets 1,010.3 933.3  
Recurring | Asset-backed securities      
Assets:      
Settlement assets 196.4 184.1  
Recurring | Corporate debt securities      
Assets:      
Settlement assets 147.7 146.9  
Recurring | State and municipal variable-rate demand notes      
Assets:      
Settlement assets 64.1 48.9  
Recurring | United States government agency mortgage-backed securities      
Assets:      
Settlement assets 18.8 20.5  
Recurring | Level 1      
Assets:      
Total assets 175.8 11.7  
Recurring | Level 1 | Money market funds      
Assets:      
Settlement assets 25.8 11.7  
Cash and cash equivalents 150.0    
Recurring | Level 2      
Assets:      
Derivatives 102.2 126.1  
Total assets 1,539.5 1,459.8  
Liabilities:      
Derivatives 84.0 98.9  
Total liabilities 84.0 98.9  
Recurring | Level 2 | State and municipal debt securities      
Assets:      
Settlement assets 1,010.3 933.3  
Recurring | Level 2 | Asset-backed securities      
Assets:      
Settlement assets 196.4 184.1  
Recurring | Level 2 | Corporate debt securities      
Assets:      
Settlement assets 147.7 146.9  
Recurring | Level 2 | State and municipal variable-rate demand notes      
Assets:      
Settlement assets 64.1 48.9  
Recurring | Level 2 | United States government agency mortgage-backed securities      
Assets:      
Settlement assets $ 18.8 $ 20.5