Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Consolidated Balance Sheets
Accounts receivable - trade, allowance for doubtful accounts	$ 12.0	$ 13.5
Property and equipment, accumulated depreciation	$ 191.1	$ 149.4
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	54,600,000	53,500,000
Treasury stock	3,800,000	1,500,000