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Settlement Assets and Obligations (Details 1) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Settlement Assets and Obligations        
Cash and cash equivalents $ 1,254.2 $ 1,131.2 $ 1,260.5  
Restricted cash 15.2 7.4 3.7  
ATM cash 525.2 515.6 543.4  
Settlement cash and cash equivalents 327.4 242.6 203.6  
Settlement restricted cash 125.0 94.0 74.9  
Cash and cash equivalents and restricted cash at end of period $ 2,247.0 $ 1,990.8 $ 2,086.1 $ 2,099.5