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Revenues - Contract Balances (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Contract Balances |  |
Accounts receivable, net | $ 944.4 | $ 929.1
Unearned revenues | 272.0 | 269.8
Revenue recognized from unearned revenue | 174.7 |
Contracts in transit |  |
Contract Balances |  |
Accounts receivable, net | 330.4 | 314.2
Vehicle receivables |  |
Contract Balances |  |
Accounts receivable, net | 251.0 | 266.9
Manufacturer receivables |  |
Contract Balances |  |
Accounts receivable, net | 200.9 | 211.3
Trade receivables |  |
Contract Balances |  |
Accounts receivable, net | $ 154.6 | $ 129.1

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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