Pension and Post Employment Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Selling, General and Administrative Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost, total	$ 0.3	$ 0.2
Europe [Member] | Foreign Pension Plan [Member] | Performance Chemicals [Member]
Defined Benefit Plan Disclosure [Line Items]
Post-employment obligations European businesses	4.8		$ 4.7
Germany [Member] | Foreign Pension Plan [Member] | Fuel Specialties [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost, total	$ 0.0	$ 0.0