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Segments (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Total Assets | $ 5,692.0 | $ 5,640.4 | $ 5,384.0
Operating segments | Domestic |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 1,506.3 |  | 1,488.0
Operating segments | Import |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 1,317.1 |  | 1,224.2
Operating segments | Luxury |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 898.0 |  | 934.6
Corporate and other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | $ 1,970.6 |  | $ 1,737.2

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