Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Other Intangible Assets [Line Items]
Goodwill impairment charge	$ 98.5
Reduced in goodwill		$ 32.4
Amortization expense for other intangible assets	24.0	27.5	$ 28.6
Business Services
Schedule Of Other Intangible Assets [Line Items]
Goodwill impairment charge	98.5
Reduced in goodwill		$ 32.4
Disposition by Sale | Business Services | Print Logistics
Schedule Of Other Intangible Assets [Line Items]
Reduced in goodwill	32.4
Disposition by Sale | GDS Business
Schedule Of Other Intangible Assets [Line Items]
Reduced in goodwill	408.9
Reduced in accumulated Impairment loss	408.9
Reduced in accumulated amortization	70.9
Disposition by Sale | GDS Business | Client Relationships
Schedule Of Other Intangible Assets [Line Items]
Reduced in intangible asset	$ 70.9