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Revenues - Other Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenues      
Total revenues $ 27,814.8 $ 25,554.7 $ 20,443.9
Commercial vehicle distribution and other      
Revenues      
Total revenues $ 578.8 575.7 454.2
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 $ 38.4 33.7  
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 $ 241.0 $ 242.8 $ 220.3