Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 9.4	$ 9.1
Inventory reserves	$ 20.2	$ 18.1
Preferred stock, par value per share (in dollars 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 (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	231,667,372	231,619,037
Common stock, shares outstanding	155,753,430	155,654,370
Common stock in treasury, shares	75,913,942	75,964,667