Segment Information - Schedule of Corporate Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 273.4	$ 317.5
Deferred income tax assets, net of valuation allowances	163.0	236.7
Investment in LSC and Donnelley Financial (Note 2)		328.7
Property, plant and equipment, net	615.1	650.3
Total assets	3,904.5	4,268.8
Corporate
Segment Reporting Information [Line Items]
Cash and cash equivalents	(37.5)	19.3	$ (45.9)
Deferred income tax assets, net of valuation allowances	36.7	67.5	41.8
Software, net	41.6	43.0	48.5
Deferred compensation plan and Company owned life insurance assets	88.6	75.3	77.4
Investment in LSC and Donnelley Financial (Note 2)		328.7
Property, plant and equipment, net	29.6	30.2	41.6
Other	39.0	83.2	62.8
Total assets	$ 198.0	$ 647.2	$ 226.2