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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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