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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Assets:    
Settlement assets $ 3,635.6 $ 3,687.0
Derivatives 15.7 10.8
Liabilities:    
Derivatives 6.7 17.4
Recurring    
Assets:    
Derivatives 15.7 10.8
Total assets 1,431.7 1,480.8
Liabilities:    
Derivatives 6.7 17.4
Total liabilities 6.7 17.4
Recurring | Money market funds    
Assets:    
Settlement assets 13.0 11.8
Recurring | State and municipal debt securities    
Assets:    
Settlement assets 1,044.8 1,011.4
Recurring | Asset-backed securities    
Assets:    
Settlement assets 213.8 195.7
Recurring | Corporate debt securities    
Assets:    
Settlement assets 86.2 152.2
Recurring | State and municipal variable-rate demand notes    
Assets:    
Settlement assets 47.7 86.8
Recurring | United States government agency mortgage-backed securities    
Assets:    
Settlement assets 10.5 12.1
Recurring | Level 1    
Assets:    
Total assets 13.0 11.8
Recurring | Level 1 | Money market funds    
Assets:    
Settlement assets 13.0 11.8
Recurring | Level 2    
Assets:    
Derivatives 15.7 10.8
Total assets 1,418.7 1,469.0
Liabilities:    
Derivatives 6.7 17.4
Total liabilities 6.7 17.4
Recurring | Level 2 | State and municipal debt securities    
Assets:    
Settlement assets 1,044.8 1,011.4
Recurring | Level 2 | Asset-backed securities    
Assets:    
Settlement assets 213.8 195.7
Recurring | Level 2 | Corporate debt securities    
Assets:    
Settlement assets 86.2 152.2
Recurring | Level 2 | State and municipal variable-rate demand notes    
Assets:    
Settlement assets 47.7 86.8
Recurring | Level 2 | United States government agency mortgage-backed securities    
Assets:    
Settlement assets $ 10.5 $ 12.1