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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Offset account related to floorplan notes payable	$ 160.4	$ 106.8
FMCC offset	$ 16.0	$ 4.1
Preferred stock
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	1,000,000	1,000,000
Shares issued (in shares)	0	0
Shares outstanding (in shares)	0	0
Common stock
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	50,000,000	50,000,000
Shares issued (in shares)	25,433,048	25,486,711
Treasury stock
Treasury stock (in shares)	7,342,546	6,858,503

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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