Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4.9	$ 4.4
Current maturities and loan origination fees	3.2	4.0
Debt issuance costs	$ 12.2	$ 14.1
Preferred stock, shares authorized (in shares)	300,000	300,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	150,000,000.0	150,000,000.0
Common stock, shares issued (in shares)	39,500,000	39,700,000
Common stock, shares outstanding (in shares)	39,500,000	39,700,000