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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Finance and Insurance Sales |  |  |
Aggregate reserves relating to chargeback activity | $ 25.8 pag_SalesCommissionChargebackReserve | $ 23.3 pag_SalesCommissionChargebackReserve |
Defined Contribution Plans |  |  |
Expense incurred relating to defined contribution plans | 17.7 us-gaap_DefinedContributionPlanCostRecognized | 15.1 us-gaap_DefinedContributionPlanCostRecognized | 13.7 us-gaap_DefinedContributionPlanCostRecognized
Advertising |  |  |
Net advertising costs | 93.3 us-gaap_AdvertisingExpense | 80.8 us-gaap_AdvertisingExpense | 79.1 us-gaap_AdvertisingExpense
Reimbursement of advertising expense | 14.3 us-gaap_CooperativeAdvertisingAmount | 13.1 us-gaap_CooperativeAdvertisingAmount | 11.9 us-gaap_CooperativeAdvertisingAmount
Self Insurance |  |  |
Aggregate reserves relating to retained risk | $ 24.6 us-gaap_FairValueConcentrationOfRiskRetainedInterest | $ 21.1 us-gaap_FairValueConcentrationOfRiskRetainedInterest |
Earnings Per Share |  |  |
Weighted average number of common shares outstanding | 90,318,839 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 90,273,747 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 90,318,315 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of non-participatory equity compensation (in shares) | 36,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 56,874 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 24,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average number of common shares outstanding, including effect of dilutive securities | 90,354,839 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 90,330,621 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 90,342,315 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Total amount received by an entity from a vendor under a cooperative advertising arrangement that has been offset against advertising expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cooperative Advertising -URI http://asc.fasb.org/extlink&oid=6509061 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 50 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6408645&loc=d3e63872-111659 + Details
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