Accounts Receivable, Accounts Payable, Vehicle Floor Plan Payable and Accrued Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Accounts Receivable, Accounts Payable, Vehicle Floor Plan Payable and Accrued Liabilities [Line Items]
Credit loss expense	$ 1.7	$ 0.5
Cash overdrafts	$ 1.3		$ 0.5
Weighted average interest rate	6.40%	5.80%
Automotive [Member]
Accounts Receivable, Accounts Payable, Vehicle Floor Plan Payable and Accrued Liabilities [Line Items]
Floor plan assistance	$ 2.2	$ 1.4
Automotive [Member] | Vehicle Floor Plan Facility - New Vehicles [Member]
Accounts Receivable, Accounts Payable, Vehicle Floor Plan Payable and Accrued Liabilities [Line Items]
Obligations outstanding related to floor plan facilities associated with new vehicles	$ 156.9		$ 128.9
Vehicle Floor Plan Facility [Member] | Automotive [Member]
Accounts Receivable, Accounts Payable, Vehicle Floor Plan Payable and Accrued Liabilities [Line Items]
Weighted average interest rate	6.90%	5.40%