Segment Information - Total Assets, Equity Method Investments, and Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Capital expenditures	$ 324.6	$ 377.8	$ 386.0
Retail Automotive
Segment Reporting Information [Line Items]
Capital expenditures	252.1	331.4	317.6
Retail Commercial Truck
Segment Reporting Information [Line Items]
Capital expenditures	67.3	41.0	60.1
Other
Segment Reporting Information [Line Items]
Capital expenditures	5.2	5.4	8.3
Non-Automotive Investments
Segment Reporting Information [Line Items]
Capital expenditures	$ 0.0	$ 0.0	$ 0.0