Discontinued Operations - Assets and Liabilities of Discontinued Operations (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total assets of discontinued operations	$ 23.1	$ 200.6
Total liabilities of discontinued operations		92.1
Disposition by Sale | Business Services | Logistics
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Receivables, net of allowance		120.6
Operating lease right-of-use assets		8.8
Goodwill		53.3
Intangible assets, net		10.9
Other assets		7.0
Total assets of discontinued operations		200.6
Accounts payable		53.3
Accrued expenses and other liabilities		38.8
Total liabilities of discontinued operations		$ 92.1