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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Dealership Finance and Insurance Sales |  |  |
Aggregate reserves relating to chargeback activity | $ 26.0 | $ 24.9 |
Defined Contribution Plans |  |  |
Expense incurred relating to defined contribution plans | 24.8 | 16.8 | $ 14.5
Advertising |  |  |
Net advertising costs | 115.3 | 115.8 | 102.5
Reimbursement of advertising expense | 19.3 | 18.6 | $ 16.6
Self Insurance |  |  |
Aggregate reserves relating to retained risk | $ 31.3 | $ 30.3 |

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