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Related Party Transactions - Joint ventures (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020
Bentley, Ferrari, Maserati | Edison, New Jersey
Related party transactions
Ownership percentage of equity method investment	20.00%	20.00%
Lexus Toyota Volkswagen | Frankfurt, Germany
Related party transactions
Ownership percentage of equity method investment	50.00%	50.00%
BMW, MINI | Barcelona Spain
Related party transactions
Ownership percentage of equity method investment	50.00%	50.00%
BMW, MINI, Rolls-Royce, Ferrari and ALPINA | Tokyo, Japan
Related party transactions
Ownership percentage of equity method investment	49.00%	49.00%
Penske Commercial Leasing Australia
Related party transactions
Ownership percentage of equity method investment	28.00%	28.00%
Audi, Mercedes-Benz, Sprinter, Porsche | Fairfield, Connecticut
Related party transactions
Ownership percentage of Consolidated Entity	80.00%	80.00%
Mercedes-Benz | Greenwich, Connecticut
Related party transactions
Ownership percentage of Consolidated Entity	80.00%	80.00%
BMW, MINI, Maserati, Porsche, Audi, Land Rover, Volvo, Mercedes-Benz, smart and Lamborghini | Northern Italy
Related party transactions
Ownership percentage of Consolidated Entity	84.10%	84.10%
Audi, Maserati, SEAT, Skoda, Volkswagen | Aachen, Germany
Related party transactions
Additional ownership percentage acquired	8.20%
Purchase price of investment in joint venture	$ 5.0
PTL
Related party transactions
Ownership interest in Penske Truck Leasing Co (as a percent)		28.90%

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