Condensed Consolidated Balance Sheets (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Receivables, allowance for doubtful accounts	$ 8.5	$ 7.3
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	1,000,000.0	1,000,000.0
Preferred stock, Issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, Authorized	65,000,000.0	65,000,000.0
Common stock, Issued	34,100,000	33,800,000
Treasury stock, Shares	100,000
Maximum
Treasury stock, Shares		100,000