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Revenues - Other Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Total revenues	$ 20,443.9	$ 23,179.4	$ 22,785.1
Commercial Vehicle Distribution and Other
Revenues
Total revenues	$ 454.2	513.1	$ 561.4
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
Finance and insurance, net | Retail Automotive and Retail Commercial Truck Dealership
Revenues
Payment period	30 days
Aggregate reserves relating to chargeback activity	$ 28.7	26.6
Penske Australia | Commercial Vehicle Distribution and Other
Revenues
Payment period	30 days
Penske Australia | Service and parts | Commercial Vehicle Distribution and Other
Revenues
Total revenues	$ 220.3	$ 265.1

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