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Commitments and Contingent Liabilities - Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Commitments and Contingent Liabilities |  |  |
Rent expense | $ 231.8 | $ 232.0 | $ 232.1
Aggregate rent paid by the tenants | 25.8 |  |
Aggregate rent currently guaranteed by the Company | 202.3 |  |
Letters of credit outstanding | 49.0 |  |
Surety bonds posted | $ 21.5 |  |

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- Definition Represents the aggregate rent currently guaranteed by entity under property lease guarantee. + References No definition available. + Details
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Balance Type: | credit
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- Definition Represents the aggregate rent paid by the tenants under property lease guaranteed by entity. + References No definition available. + Details
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- Definition Surety bonds posted. + References No definition available. + Details
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Namespace Prefix: | pag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
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