Segments (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total Assets	$ 6,395.7	$ 6,077.4	$ 6,083.9
Operating segments | Domestic
Segment Reporting Information [Line Items]
Total Assets	1,249.9		1,467.6
Operating segments | Import
Segment Reporting Information [Line Items]
Total Assets	1,477.7		1,306.5
Operating segments | Luxury
Segment Reporting Information [Line Items]
Total Assets	869.3		945.2
Corporate and other
Segment Reporting Information [Line Items]
Total Assets	$ 2,798.8		$ 2,364.6