Divestitures and Held for Sale - Summary of Amounts Included in Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 540.9	$ 1,205.9
Cost of products sold	378.8	805.8
Selling, general and administrative expenses	76.7	254.1
Restructuring costs, net		2.5
Impairment of goodwill, intangibles and other assets	174.7
Operating income (loss)	(89.3)	143.5
Non-operating expense (income)	(3.2)	0.4
Income (loss) before income taxes	(86.1)	143.1
Income tax expense (benefit)	(6.7)	35.1
Net income (loss)	$ (79.4)	$ 108.0