Segment Information - Financial Information by Reportable Segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment	2
Net Sales (from external customers):
Net Sales	$ 823.8	$ 534.8
Adjusted EBITDA:
Operating profit	52.1	2.2
Adjusted EBITDA	168.4	132.1
Performance Materials
Net Sales (from external customers):
Net Sales	420.0	180.3
Adjusted EBITDA:
Operating profit	83.0	49.0
ArgoSolutions
Net Sales (from external customers):
Net Sales	403.8	354.5
Adjusted EBITDA:
Operating profit	$ 85.4	$ 83.1