Segments (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Assets	$ 10,092.5	$ 7,902.1
Operating segments | Domestic
Segment Reporting Information [Line Items]
Assets	1,298.3	1,262.4
Operating segments | Import
Segment Reporting Information [Line Items]
Assets	1,579.1	1,654.7
Operating segments | Luxury
Segment Reporting Information [Line Items]
Assets	1,057.9	1,132.4
Corporate and other
Segment Reporting Information [Line Items]
Assets	$ 6,157.2	$ 3,852.6