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Revenues - Contract Balances (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Contract Balances    
Accounts receivable $ 1,201.6 $ 1,002.1
Unearned revenues 290.1 266.8
Contracts in transit    
Contract Balances    
Accounts receivable 343.3 281.7
Vehicle receivables    
Contract Balances    
Accounts receivable 205.9 136.3
Manufacturer receivables    
Contract Balances    
Accounts receivable 244.5 233.3
Trade receivables    
Contract Balances    
Accounts receivable $ 385.1 $ 326.9