Pension Plans and Other Postretirement Benefits Multiemployer Plan (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Chemetall Surface Treatment
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions		$ 0.2		$ 0.4
Continuing Operations
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	$ 0.3	$ 0.3	$ 0.5	$ 0.6
Selling, general and administrative expenses | Financial Improvement Plan
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	2.0		2.0
Other expenses, net | Financial Improvement Plan
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	$ 2.9		$ 2.9