Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 9.9	$ 9.1
Inventory reserves	$ 22.2	$ 18.1
Preferred stock, par value per share (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value per share (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	231,655,982	231,619,037
Common stock, shares outstanding (in shares)	154,546,260	155,654,370
Common stock in treasury, shares (in shares)	77,109,722	75,964,667