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Discontinued Operations and Divestitures (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2015
Combined financial information regarding entities accounted for as discontinued operations
Revenues	$ 261.7us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 524.8us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 690.5us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Pre-tax loss	(35.6)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	(6.2)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	(18.2)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Gain on disposal	14.8us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0.8us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	8.1us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Balance Sheet information regarding entities accounted for as discontinued operations
Inventory	34.7us-gaap_InventoriesPropertyHeldForSaleCurrent	72.6us-gaap_InventoriesPropertyHeldForSaleCurrent
Other assets	151.4us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	181.2us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets
Total assets	186.1us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	253.8us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Floor plan notes payable (including non-trade)	27.9pag_DisposalGroupIncludingDiscontinuedOperationFloorPlanNotesPayable	57.5pag_DisposalGroupIncludingDiscontinuedOperationFloorPlanNotesPayable
Other liabilities	104.8us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities	109.0us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities
Total liabilities	132.7us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	166.5us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Hertz car rental franchise | Subsequent event
Combined financial information regarding entities accounted for as discontinued operations
Proceeds from sale of business				$ 17.8us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pag_HertzCarRentalFranchiseMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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Disposal group including discontinued operation floor plan notes payable.

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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount classified as inventory attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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