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Revenues - Contract Balances (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Contract Balances |  |
Accounts receivable | $ 1,002.1 | $ 1,114.6
Unearned revenues | 266.8 | 280.2
Contracts in transit |  |
Contract Balances |  |
Accounts receivable | 281.7 | 361.9
Vehicle receivables |  |
Contract Balances |  |
Accounts receivable | 136.3 | 170.6
Manufacturer receivables |  |
Contract Balances |  |
Accounts receivable | 233.3 | 218.9
Trade receivables |  |
Contract Balances |  |
Accounts receivable | $ 326.9 | $ 344.1

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