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Inventories (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Inventories |  |  |
Retail automotive dealership new vehicles | $ 1,810.9 | $ 2,346.2 |
Retail automotive dealership used vehicles | 1,019.7 | 1,080.8 |
Retail automotive parts, accessories and other | 117.2 | 141.5 |
Retail commercial truck dealership vehicles and parts | 223.1 | 465.2 |
Commercial vehicle distribution vehicles, parts and engines | 254.7 | 227.0 |
Total inventories | 3,425.6 | 4,260.7 |
Interest credits and advertising assistance | $ 52.6 | $ 51.6 | $ 54.6

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- Definition Represents the carrying amount of commercial distribution vehicle inventory, net of valuation reserves. + References No definition available. + Details
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- Definition Represents the carrying amount of commercial vehicle inventory, net of valuation reserves. + References No definition available. + Details
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- Definition Carrying amount of new vehicle inventory, net of valuation reserves. + References No definition available. + Details
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- Definition Carrying amount of parts, accessories and other inventory, net of valuation reserves. + References No definition available. + Details
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- Definition Carrying amount of used vehicle inventory, net of valuation reserves. + References No definition available. + Details
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- Definition Floor plan interest credits and advertising assistance received from vendors, which reduce the cost of sales. + References No definition available. + Details
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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