Commitments and Contingencies - Additional Information (Detail) $ in Millions	Sep. 30, 2016 USD ($) LegalMatter	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number | LegalMatter	4,000
Environmental Reserve Other Accrued Costs	$ 18.0	$ 22.8
Letters of credit outstanding	$ 337.0	402.2
Valves And Controls [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number | LegalMatter	3,500
Liability For Claims And Contingencies	$ 231.2	237.9
Liability Reserve For Insurance Claims	109.3	111.0
Letters of credit outstanding	$ 179.7	$ 202.3