CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Accounts receivable, net of allowances of $6.6 and $8.5	$ 6.6	$ 8.5
Shareholders’ equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	38,861,992	38,861,992
Common stock, shares outstanding (in shares)	37,335,467	37,093,774
Treasury stock at cost (in shares)	1,526,525	1,768,218