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Revenues - Contract Balances (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Jan. 02, 2018 | Dec. 31, 2017
Contract Balances |  |  |
Accounts receivable, net | $ 953.4 | $ 977.3 | $ 954.9
Unearned revenues | 271.7 |  | 302.6
Revenue recognized from unearned revenue | 220.3 |  |
Contracts in transit |  |  |
Contract Balances |  |  |
Accounts receivable, net | 318.7 |  | 356.1
Vehicle receivables |  |  |
Contract Balances |  |  |
Accounts receivable, net | 251.9 |  | 233.0
Manufacturer receivables |  |  |
Contract Balances |  |  |
Accounts receivable, net | 216.8 |  | 230.1
Trade receivables |  |  |
Contract Balances |  |  |
Accounts receivable, net | $ 158.9 |  | $ 136.7

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