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Revenues - Contract Balances (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Contract Balances |  |
Accounts receivable | $ 1,062.8 | $ 1,114.6
Unearned revenues | 267.4 | 280.2
Contracts in transit |  |
Contract Balances |  |
Accounts receivable | 319.8 | 361.9
Vehicle receivables |  |
Contract Balances |  |
Accounts receivable | 175.8 | 170.6
Manufacturer receivables |  |
Contract Balances |  |
Accounts receivable | 212.0 | 218.9
Trade receivables |  |
Contract Balances |  |
Accounts receivable | $ 334.8 | $ 344.1

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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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-2 + Details
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