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Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of the changes in the carrying amount of goodwill by reportable segment |  |  |
Goodwill, Beginning Balance | $ 1,134.9 us-gaap_Goodwill | $ 961.5 us-gaap_Goodwill |
Goodwill, Additions | 165.4 us-gaap_GoodwillAcquiredDuringPeriod | 165.5 us-gaap_GoodwillAcquiredDuringPeriod |
Goodwill, Deconsolidation of Italian investment |  | (7.2)pag_GoodwillWrittenOffRelatedToSaleOfBusinessUnitAndImpairmentLosses |
Goodwill, Reconsolidation of Italian investment |  | 7.4 pag_GoodwillReconsolidationFromBusinessCombination |
Goodwill, Foreign currency translation | (34.0)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments | 7.7 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments |
Goodwill, Ending Balance | 1,266.3 us-gaap_Goodwill | 1,134.9 us-gaap_Goodwill | 961.5 us-gaap_Goodwill
Impairment of intangible assets | 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill | 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill | 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Retail Automotive |  |  |
Summary of the changes in the carrying amount of goodwill by reportable segment |  |  |
Goodwill, Beginning Balance | 1,020.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember | 961.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember |
Goodwill, Additions | 53.7 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember | 49.6 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember |
Goodwill, Deconsolidation of Italian investment |  | (7.2)pag_GoodwillWrittenOffRelatedToSaleOfBusinessUnitAndImpairmentLosses / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember |
Goodwill, Reconsolidation of Italian investment |  | 7.4 pag_GoodwillReconsolidationFromBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember |
Goodwill, Foreign currency translation | (24.7)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember | 9.2 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember |
Goodwill, Ending Balance | 1,049.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember | 1,020.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pag_RetailMember |
Other |  |  |
Summary of the changes in the carrying amount of goodwill by reportable segment |  |  |
Goodwill, Beginning Balance | 114.4 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |
Goodwill, Additions | 111.7 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 115.9 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Goodwill, Foreign currency translation | (9.3)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (1.5)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Goodwill, Ending Balance | $ 216.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ 114.4 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |

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- Definition Represents the amount of goodwill on account of business combination of all or a portion of a reporting unit during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of goodwill written off on account of impairment losses and on sale of all or a portion of a reporting unit during the period. + References No definition available. + Details
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Namespace Prefix: | pag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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