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Deferred Client Conversion and Start-Up Costs - Schedule of Deferred Client Conversion and Start-Up Costs (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Jun. 30, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Deferred client conversion and start-up costs $ 925.4 $ 1,224.7
Other start-up costs 11.5 7.7
Deferred client conversion and start-up costs $ 937.0 $ 1,232.3