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Revenues - Other Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Aggregate reserves relating to chargeback activity	$ 26,600	$ 26,000
Total revenues	23,179,400	22,785,100	$ 21,386,900
Commercial Vehicle Distribution and Other
Revenues
Total revenues	$ 513,100	561,400	$ 514,600
Vehicle Sales | Retail Automotive and Retail Commercial Truck Dealership
Revenues
Payment period	30 days
Service and parts | Retail Automotive and Retail Commercial Truck Dealership
Revenues
Payment period	30 days
Customer return period, parts sales	30 days
Finance and insurance, net | Retail Automotive and Retail Commercial Truck Dealership
Revenues
Payment period	30 days
Aggregate reserves relating to chargeback activity	$ 26,600	26,000
Penske Commercial Vehicles Australia | Commercial Vehicle Distribution and Other
Revenues
Payment period	30 days
Penske Commercial Vehicles Australia | Service and parts | Commercial Vehicle Distribution and Other
Revenues
Total revenues	$ 265,100	$ 257,600

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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