Discontinued Operations - Results of Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net income (loss) from discontinued operations	$ 0.4	$ 19.8	$ (19.5)	$ 4.9
Business Services | Disposition by Sale | Logistics | DLS Worldwide
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	190.5	217.3	558.5	652.1
Cost of sales	(164.1)	(190.7)	(484.1)	(569.3)
Selling, general, administrative and other operating expenses	(21.3)	(23.8)	(69.7)	(71.1)
Restructuring, impairment and other expense	(0.2)	(0.1)	(21.0)	(0.1)
Operating income (loss) from discontinued operations	4.9	2.7	(16.3)	11.6
Income tax expense (benefit)	4.5	(17.1)	3.2	6.7
Net income (loss) from discontinued operations	$ 0.4	$ 19.8	$ (19.5)	$ 4.9