Subsequent Events - USD ($) $ in Millions		Jun. 22, 2023	Jun. 22, 2022	Oct. 28, 2021	Oct. 15, 2021	Oct. 06, 2021	Oct. 01, 2021	Sep. 30, 2021	Dec. 31, 2020
Revolving Secured Line of Credit [Member]
Subsequent Event [Line Items]
Amount available for borrowing	[1]							$ 267.8	$ 244.1
Subsequent Event [Member] | Revolving Secured Line of Credit [Member]
Subsequent Event [Line Items]
Amount available for borrowing		$ 325.0	$ 350.0			$ 385.0	$ 340.0
Subsequent Event [Member] | Warehouse Facility VI [Member]
Subsequent Event [Line Items]
Amount available for borrowing					$ 75.0
Subsequent Event [Member] | Term ABS 2021-4 [Member]
Subsequent Event [Line Items]
Amount available for borrowing				$ 250.1

[1] Availability may be limited by the amount of assets pledged as collateral.