Pensions and Postretirement Benefits - Schedule of Net Periodic Benefit Cost (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,000,000.0	$ 1,100,000
Interest cost	2,800,000	3,000,000.0
Expected return on plan assets	(4,700,000)	(4,000,000.0)
Amortization of net loss (gain)	1,300,000	1,600,000
Curtailment loss	300,000	0
Net periodic benefit cost	700,000	1,700,000
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	100,000
Interest cost	0	0
Expected return on plan assets	0	0
Amortization of net loss (gain)	(1,100,000)	0
Net periodic benefit cost	(1,100,000)	$ 100,000
U.S.
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	0
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Expected future contributions	$ 0