Auto Loans Receivable - Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Millions			12 Months Ended
		Oct. 01, 2022	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning of year			$ 0.0
Provision for credit losses			43.8	[1]	$ 0.0	$ 0.0
Initial allowance for purchased credit-deteriorated loans			21.7
Write-offs			(13.9)
Recoveries	[2]		5.9
Balance as of end of year			$ 57.5		$ 0.0
CIG Financial Acquisition
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses		$ 34.2

[1] (1) Includes initial credit loss expense of $34.2 million associated with the auto loan portfolio acquired in the acquisition of CIG Financial on October 1, 2022.

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