Segments - Segment Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 6,083.9	$ 5,643.7	$ 5,384.0
Operating Segments | Domestic
Segment Reporting Information [Line Items]
Total assets	1,467.6		1,488.0
Operating Segments | Import
Segment Reporting Information [Line Items]
Total assets	1,306.5		1,224.2
Operating Segments | Luxury
Segment Reporting Information [Line Items]
Total assets	945.2		934.6
Corporate and other
Segment Reporting Information [Line Items]
Total assets	$ 2,364.6		$ 1,737.2