Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Trade receivables, net of allowance for doubtful accounts	$ 22.6	$ 24.9
Inventory reserves	$ 27.4	$ 21.9
Preferred stock, par value per share	$ 0.10	$ 0.10
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Common stock, par value per share	$ 0.10	$ 0.10
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	227,148,951	225,625,636
Common stock, shares outstanding	196,719,612	196,013,299
Common stock in treasury, shares	30,429,339	29,612,337