Acquired Card Receivables - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Acquired Card Receivables [Abstract]
Acquired card receivable as collateral	$ 210.8		$ 210.8
Authorized transactions but not cleared	19.2		$ 19.2
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	2,700.0		$ 2,700.0
Card receivables acquired during the period	$ 4,300.0	$ 3,300.0	$ 12,600.0	$ 9,400.0