Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Property, plant and equipment, accumulated depreciation and amortization	$ 491.0	$ 447.5
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	62,512,968	62,263,395
Common stock, shares outstanding	47,859,751	47,992,348
Treasury stock, shares	14,653,217	14,271,047