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Revenues - Other Disclosures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenues          
Total revenues $ 6,497.3 $ 5,971.6 $ 19,258.6 $ 14,631.8  
Commercial vehicle distribution          
Revenues          
Total revenues 145.1 122.7 $ 441.9 322.2  
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 32.2   $ 32.2   $ 28.7
Penske Australia | Commercial vehicle distribution          
Revenues          
Payment period     30 days    
Penske Australia | Service and parts | Commercial vehicle distribution          
Revenues          
Total revenues $ 69.5 $ 58.4 $ 210.7 $ 159.2