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

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