Pension Plans and Other Postretirement Benefits - Multiemployer Plan (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Chemetall Surface Treatment
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions		$ 0.2		$ 0.6
Continuing Operations
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	$ 0.3	$ 0.3	$ 0.8	$ 0.8
Selling, general and administrative expenses | Financial Improvement Plan
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions			2.0
Other (expenses) income, net | Financial Improvement Plan
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	$ 1.6		$ 4.6