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Equity (Details) (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
Stock Repurchase Period |  |  |
Repurchase of common stock | $ 15.5 us-gaap_StockRepurchasedDuringPeriodValue | $ 15.8 us-gaap_StockRepurchasedDuringPeriodValue | $ 9.8 us-gaap_StockRepurchasedDuringPeriodValue
Acquired Employee Equity Awards |  |  |
Stock Repurchase Period |  |  |
Repurchased shares | 160,350 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = pag_ShareRepurchaseEmployeeEquityAwardsMember | 97,818 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = pag_ShareRepurchaseEmployeeEquityAwardsMember | 55,631 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = pag_ShareRepurchaseEmployeeEquityAwardsMember
Repurchase of common stock | 7.5 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = pag_ShareRepurchaseEmployeeEquityAwardsMember | 3.1 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = pag_ShareRepurchaseEmployeeEquityAwardsMember | 1.3 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = pag_ShareRepurchaseEmployeeEquityAwardsMember
Repurchased shares, average price (in dollars per share) | $ 46.48 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = pag_ShareRepurchaseEmployeeEquityAwardsMember | $ 32.13 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = pag_ShareRepurchaseEmployeeEquityAwardsMember | $ 23.49 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = pag_ShareRepurchaseEmployeeEquityAwardsMember
Share Repurchase Program |  |  |
Stock Repurchase Period |  |  |
Repurchased shares | 175,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember | 410,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember | 350,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember
Repurchase of common stock | 8.0 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember | 12.7 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember | 8.5 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember
Repurchased shares, average price (in dollars per share) | $ 45.95 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember | $ 30.93 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember | $ 24.35 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember
Amount authorized to be repurchased | $ 150.0 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = pag_BoardAuthorizedRepurchaseProgramMember |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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