Acquired Card Receivables - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Acquired Card Receivables [Abstract]
Acquired card receivable as collateral	$ 191.4		$ 191.4
Authorized transactions but not cleared	15.8		$ 15.8
Grace period to payment on acquired card receivables			5 days
Acquired card receivables, minimum number of past due days to accrue fees			90 days
Unused credit available	2,100.0		$ 2,100.0
Card receivables acquired during the period	$ 4,300.0	$ 3,300.0	$ 8,300.0	$ 6,000.0