Commitments and Contingencies (Additional Information) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) claims	Dec. 31, 2017 USD ($) claims	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Number of claims dismissed | claims	192	258
Number of claims settled | claims	25	22
Claims settlements amount	$ 7.1	$ 5.0
Projection period (years)	40 years	10 years
Asbestos-related claims	$ 70.3	$ 76.2
Recorded third-party environmental recoveries receivable	63.8	69.2
Environmental remediation expense (income)	$ 0.7	$ 3.4	$ 0.3
Minimum
Loss Contingencies [Line Items]
Operating lease period	1 year
Maximum
Loss Contingencies [Line Items]
Operating lease period	5 years
Connecticut Voluntary Corrective Action Program
Loss Contingencies [Line Items]
Environmental remediation expense	$ 0.7
Estimated total cleanup costs, accrual	$ 1.7