Summary of Significant Accounting Policies $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2021 segment	Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments | segment			1
Uninsured cash and cash equivalents	$ 17.3			$ 22.9
Provision for credit losses	23.3	$ 21.3
Restricted Cash and Cash Equivalents [Member]
Summary Of Significant Accounting Policies [Line Items]
Uninsured cash and cash equivalents	477.8			$ 407.9
New Consumer Loan Assignments [Member]
Summary Of Significant Accounting Policies [Line Items]
Provision for credit losses	102.6	131.8
Loans Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Provision for credit losses	$ 0.0	$ 0.0