Segment Information - Total Assets, Equity Method Investments, and Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Capital expenditures	$ 368.7	$ 375.3	$ 282.5
Retail Automotive
Segment Reporting Information [Line Items]
Capital expenditures	322.3	306.9	245.6
Retail Commercial Truck
Segment Reporting Information [Line Items]
Capital expenditures	41.0	60.1	31.2
Other
Segment Reporting Information [Line Items]
Capital expenditures	5.4	8.3	5.7
Non-Automotive Investments
Segment Reporting Information [Line Items]
Capital expenditures	$ 0.0	$ 0.0	$ 0.0