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Inventories (Components of Inventories, net) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Inventory [Line Items] |  |
Total inventories | $ 2,431.9 | $ 2,365.3
New vehicles |  |
Inventory [Line Items] |  |
Total inventories | 1,751.3 | 1,700.1
Used vehicles |  |
Inventory [Line Items] |  |
Total inventories | 591.5 | 576.8
Parts and accessories |  |
Inventory [Line Items] |  |
Total inventories | $ 89.1 | $ 88.4

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