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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

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