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Revenues - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Revenues          
Total revenues $ 7,590.8 $ 7,447.8 $ 22,735.3 $ 22,255.3  
Unearned revenue recognized as revenue     $ 176.6    
Commercial vehicle distribution and other          
Revenues          
Payment period     45 days    
Total revenues 186.8 157.7 $ 553.8 444.6  
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    
Service and parts | Commercial vehicle distribution and other          
Revenues          
Total revenues 68.8 $ 68.4 $ 206.7 $ 197.7  
Finance and insurance, net | Retail Automotive and Retail Commercial Truck Dealership          
Revenues          
Payment period     30 days    
Aggregate reserves relating to chargeback activity $ 48.4   $ 48.4   $ 42.7