Commitments and Contingencies - Narrative (Detail) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2021 USD ($)	Mar. 31, 2021 USD ($) Facility	Dec. 31, 2020 USD ($)
Commitment And Contingencies [Line Items]
Number of sites cited as potentially responsible party | Facility		4
Number of previously and currently owned sites with potential remediation obligations | Facility		6
Gain on settlement of multiemployer pension plan obligation		$ 1.7
Subsequent Event
Commitment And Contingencies [Line Items]
Multi employer plan pension plan obligation settlement payment	$ 9.2
Donnelley Financial Solutions, Inc.
Commitment And Contingencies [Line Items]
Potential contingent obligations		2.3
LSC Communications, Inc.
Commitment And Contingencies [Line Items]
Potential contingent obligations		43.4
Multi-employer pension plan obligation		$ 100.0
Multi-employer pension plan obligation payment period		13 years
Multi-employer pension plan, present value of estimated future payments			$ 37.1