Acquisition (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Aug. 31, 2016	Aug. 30, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Aug. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Transaction and integration-related costs				$ 82,841	$ 0		$ 90,550	$ 0
Goodwill			$ 925,700	925,700			925,700		$ 62,016
Axiall Corporation [Member]
Business Acquisition [Line Items]
Equity interest in acquiree held prior to combination, shares		3.1
Offer price per share (usd per share)	$ 33.00
Purchase price	$ 2,526,080
Contribution to net sales			257,407
Contribution to net loss			(47,164)
Divestitures						$ 26,666
Restructuring						22,881
Legal and settlement claims, net						$ 23,376
Transaction and integration-related costs							90,550
Professional fees			$ 43,895	$ 43,895			43,895
Change-in-control severance and other benefit costs							$ 46,655
Goodwill	$ 863,144