Acquisitions (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 3.3
Weighted Average Amortization Period (in years)	20 years
Inventories	$ 26.4
Properties and equipment	99.7
Goodwill	403.7	$ 336.5
Intangible assets	52.7
Net assets acquired	$ 248.7
Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period (in years)	20 years
Intangible assets	$ 8.3
Trademarks [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period (in years)	20 years
Intangible assets	$ 13.4
Customer Lists [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period (in years)	20 years
Intangible assets	$ 31.0
Polyolefin Catalysts [Member]
Business Acquisition [Line Items]
Goodwill	$ 69.9