Discontinued Operations - Results of Discontinued Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net income (loss) from discontinued operations	$ 124.9	$ (88.4)	$ 20.6
Business Services | Disposition by Sale | Logistics
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	632.5	865.7	1,203.8
Cost of sales	(548.6)	(758.7)	(1,070.5)
Selling, general, administrative and other operating expenses	(66.2)	(95.1)	(109.6)
Restructuring, impairment and other expense	(21.1)	(98.6)	(0.2)
Operating income (loss) from discontinued operations	(3.4)	(86.7)	23.5
Income tax expense	(0.9)	1.7	3.2
Net income (loss) from discontinued operations	$ (2.5)	$ (88.4)	$ 20.3