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Inventory And Vehicle Floorplan Payable (Components Of Inventory) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Inventory [Line Items] |  |
Inventory | $ 2,432.3 | $ 3,305.8
New Vehicle [Member] |  |
Inventory [Line Items] |  |
Inventory | 1,716.7 | 2,490.8
Used Vehicle [Member] |  |
Inventory [Line Items] |  |
Inventory | 493.9 | 570.0
Parts and Service [Member] |  |
Inventory [Line Items] |  |
Inventory | $ 221.7 | $ 245.0

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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=118951113&loc=d3e6676-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116846819&loc=d3e3927-108312 Reference 3: 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=6877327&loc=d3e13212-122682 + Details
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