Acquisition (Purchase Price Allocation) (Details) - USD ($) $ in Thousands	Aug. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 925,700	$ 62,016
Customer Relationships [Member]
Business Acquisition [Line Items]
Weighted average useful life	10 years 8 months 12 days
Trade Name [Member]
Business Acquisition [Line Items]
Weighted average useful life	6 years 9 months 18 days
Technology [Member]
Business Acquisition [Line Items]
Weighted average useful life	5 years 4 months 24 days
Supply Contracts and Leases [Member]
Business Acquisition [Line Items]
Weighted average useful life	6 years
Axiall Corporation [Member]
Business Acquisition [Line Items]
Cash	$ 88,251
Accounts receivable	422,023
Income tax receivable	48,398
Inventories	302,868
Prepaid expenses and other current assets	48,435
Property, plant and equipment	3,189,582
Other assets	105,214
Total assets acquired	4,882,981
Accounts and notes payable	253,967
Interest payable	8,154
Income tax payable	1,921
Accrued compensation	30,057
Accrued liabilities	165,793
Deferred income taxes	973,799
Tax reserve non-current	3,130
Pension and other post retirement obligations	311,106
Other liabilities	114,528
Long-term debt	1,187,290
Total liabilities assumed	3,049,745
Total identifiable net assets acquired	1,833,236
Noncontrolling interest	(68,000)
Goodwill	863,144
Total purchase consideration	2,628,380
Axiall Corporation [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived intangibles	560,000
Axiall Corporation [Member] | Trade Name [Member]
Business Acquisition [Line Items]
Finite-lived intangibles	50,000
Axiall Corporation [Member] | Technology [Member]
Business Acquisition [Line Items]
Finite-lived intangibles	41,500
Axiall Corporation [Member] | Supply Contracts and Leases [Member]
Business Acquisition [Line Items]
Finite-lived intangibles	$ 26,710