Discontinued Operations - Schedule of Non-Cash Items and Capital Expenditures of Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment charges		$ 13.9	$ 22.4	$ 558.3
Loss on debt extinguishments	$ 10.8	$ 32.4	$ 20.1
Assumption of warehousing equipment related to client contract				8.8
Donnelley Financial Solutions And L S C Communications | Discontinued Operations Spinoff
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Depreciation and amortization				159.0
Pension settlement charges				77.7
Impairment charges				1.5
Loss on debt extinguishments				96.1
Assumption of warehousing equipment related to client contract				8.8
Purchase of property, plant and equipment				$ (49.0)