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Organization and Summary of Significant Accounting Policies - Revenue, Defined Contrib. Plans, Advertising, Self-Insurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plans
Expense incurred relating to defined contribution plans	$ 21.1	$ 29.4	$ 24.8
Advertising
Net advertising costs	81.1	112.6	115.3
Reimbursement of advertising expense	13.3	19.2	$ 19.3
Self Insurance
Aggregate reserves relating to retained risk	29.7	28.6
Finance and insurance, net | Retail Automotive and Retail Commercial Truck Dealership
Dealership Finance and Insurance Sales
Aggregate reserves relating to chargeback activity	$ 28.7	$ 26.6
Payment period	30 days

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