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Inventories (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 02, 2018 | Dec. 31, 2017
Inventories |  |  |  |  |  |
Retail automotive dealership new vehicles | $ 2,298.8 |  | $ 2,298.8 |  |  | $ 2,344.1
Retail automotive dealership used vehicles | 1,014.8 |  | 1,014.8 |  |  | 993.1
Retail automotive parts, accessories and other | 124.8 |  | 124.8 |  |  | 141.7
Retail commercial truck dealership vehicles and parts | 226.3 |  | 226.3 |  |  | 207.0
Commercial vehicle distribution vehicles, parts and engines | 230.4 |  | 230.4 |  |  | 258.2
Total inventories | 3,895.1 |  | 3,895.1 |  | $ 3,930.7 | $ 3,944.1
Interest credits and advertising assistance | $ 13.6 | $ 10.6 | $ 25.6 | $ 20.7 |  |

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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://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details
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