Auto Loans Receivable - Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning of year		$ 57.5
Provision for credit losses		22.7	$ 0.0
Write-offs		(30.6)
Recoveries	[1]	13.5
Balance as of June 30, 2023		$ 63.1

[1] (1) Net of costs incurred to recover vehicle collateral.