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Related Party Transactions - Joint ventures (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2021
Jun. 30, 2021
Dec. 31, 2021
Lexus, Toyota, Volkswagen | Frankfurt, Germany      
Related party transactions      
Ownership percentage of equity method investment     50.00%
BMW, MINI | Barcelona, Spain      
Related party transactions      
Ownership percentage of equity method investment     50.00%
Penske Commercial Leasing Australia      
Related party transactions      
Ownership percentage of equity method investment     28.00%
Audi, Mercedes-Benz, Sprinter, Porsche | Fairfield, Connecticut      
Related party transactions      
Ownership percentage of Consolidated Entity     80.00%
Mercedes-Benz | Greenwich, Connecticut      
Related party transactions      
Ownership percentage of Consolidated Entity     80.00%
BMW, MINI, Maserati, Porsche, Audi, Land Rover, Volvo, Mercedes-Benz, smart, Lamborghini | Northern Italy      
Related party transactions      
Ownership percentage of Consolidated Entity     84.10%
BMW, MINI, Rolls-Royce, Ferrari and Alpina | Tokyo, Japan      
Related party transactions      
Additional ownership percentage acquired 51.00%    
Bentley, Ferrari, and Maserati | Edison, New Jersey      
Related party transactions      
Ownership interest sold   20.00%  
Proceeds from Sale of Equity Method Investments   $ 3.0  
PTL      
Related party transactions      
Ownership interest in Penske Truck Leasing Co (as a percent)     28.90%