Commitments and Contingencies - Narrative (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) Facility	Dec. 31, 2019 USD ($)
Commitment And Contingencies [Line Items]
Number of sites cited as potentially responsible party | Facility	3
Number of previously and currently owned sites with potential remediation obligations | Facility	6
Donnelley Financial Solutions, Inc.
Commitment And Contingencies [Line Items]
Potential contingent obligations	$ 4.3	$ 5.5
LSC Communications, Inc.
Commitment And Contingencies [Line Items]
Potential contingent obligations	65.2	$ 78.8
Multi-employer pension plan obligation	$ 100.0
Multi-employer pension plan obligation payment period	13 years