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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 | $ 261.7 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 524.8 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 690.5 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue |
Pre-tax loss | (35.6)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | (6.2)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | (18.2)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax |
Gain on disposal | 14.8 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0.8 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 8.1 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |
Balance Sheet information regarding entities accounted for as discontinued operations |  |  |  |
Inventory | 34.7 us-gaap_InventoriesPropertyHeldForSaleCurrent | 72.6 us-gaap_InventoriesPropertyHeldForSaleCurrent |  |
Other assets | 151.4 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets | 181.2 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets |  |
Total assets | 186.1 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent | 253.8 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |  |
Floor plan notes payable (including non-trade) | 27.9 pag_DisposalGroupIncludingDiscontinuedOperationFloorPlanNotesPayable | 57.5 pag_DisposalGroupIncludingDiscontinuedOperationFloorPlanNotesPayable |  |
Other liabilities | 104.8 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities | 109.0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities |  |
Total liabilities | 132.7 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent | 166.5 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent |  |
Hertz car rental franchise | Subsequent event |  |  |  |
Combined financial information regarding entities accounted for as discontinued operations |  |  |  |
Proceeds from sale of business |  |  |  | $ 17.8 us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pag_HertzCarRentalFranchiseMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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