Related Party Transactions - Profit Sharing Agreement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Net sales and operating revenues	$ 13,604.0	$ 12,814.0	$ 5,587.0
Other sales and revenues
Related Party Transaction [Line Items]
Net sales and operating revenues	741.0	$ 1,043.0	$ 401.0
DriveTime Automotive Group, Inc. | Other sales and revenues
Related Party Transaction [Line Items]
Net sales and operating revenues	$ 3.0