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Revenues - Contract Balances (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Contract Balances    
Accounts receivable $ 1,021.7 $ 1,114.6
Unearned revenues 312.6 280.2
Contracts in transit    
Contract Balances    
Accounts receivable 289.5 361.9
Vehicle receivables    
Contract Balances    
Accounts receivable 155.5 170.6
Manufacturer receivables    
Contract Balances    
Accounts receivable 233.2 218.9
Trade receivables    
Contract Balances    
Accounts receivable $ 321.0 $ 344.1