The Company and Its Significant Accounting Policies - Acquired Card Receivables (Details) $ in Millions	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
Accounting Policies [Abstract]
Participation interest required to be purchased	1
Number of days delinquent to become charged-off	120 days
Allowance for potential credit losses for acquired card receivables	$ 20.9	$ 15.5