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Organization and Summary of Significant Accounting Policies (Details 3) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Finance and Insurance Sales |  |  |
Aggregate reserves relating to chargeback activity | $ 23.3 | $ 23.4 |
Defined Contribution Plans |  |  |
Expense incurred relating to defined contribution plans | 15.1 | 13.7 | 11.8
Advertising |  |  |
Net advertising costs | 81.8 | 80.1 | 67.7
Reimbursement of advertising expense | 13.1 | 12.1 | 10.5
Self Insurance |  |  |
Aggregate reserves relating to retained risk | $ 21.1 | $ 20.1 |
Earnings Per Share |  |  |
Weighted average number of common shares outstanding | 90,273,747 | 90,318,315 | 91,153,620
Effect of non-participatory equity compensation (in shares) | 56,874 | 24,000 | 120,512
Weighted average number of common shares outstanding, including effect of dilutive securities | 90,330,621 | 90,342,315 | 91,274,132

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