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Revenues - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues      
Total revenues $ 30,455.2 $ 29,527.4 $ 27,814.8
Revenue recognized from unearned revenue $ 199.4    
Commercial vehicle distribution and other      
Revenues      
Payment period 45 days    
Total revenues $ 777.9 634.0 578.8
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    
Finance and insurance, net | Retail Automotive and Retail Commercial Truck Dealership      
Revenues      
Aggregate reserves relating to chargeback activity $ 48.2 42.7  
Service and parts | Commercial vehicle distribution and other      
Revenues      
Total revenues $ 274.1 $ 265.2 $ 241.0