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Long-Term Debt (Exchange Offers) (Details) - USD ($) $ in Thousands | Mar. 27, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Aug. 10, 2016
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 3,602,889 | $ 3,677,889 |  |
Senior Notes [Member] | 3.60% Percentage Senior Notes Due 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  |  |  | $ 750,000
Stated interest rate (percent) |  |  |  |  | 3.60%
Exchange Offer Percentage | 99.9667% |  |  |  |
Senior Notes [Member] | 5.0% Percentage Senior Notes Due 2046 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  |  |  | $ 700,000
Stated interest rate (percent) |  |  |  |  | 5.00%
Exchange Offer Percentage | 100.00% |  |  |  |
Senior Notes [Member] | 4.625% Senior Notes Due 2021 (New Westlake 2021 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 624,793 | 624,793 |  |
Stated interest rate (percent) |  | 4.625% |  | 4.625% |
Senior Notes [Member] | 4.875% Senior Notes Due 2023 (New Westlake 2023 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 433,793 | 433,793 |  |
Stated interest rate (percent) |  | 4.875% |  | 4.875% |
Senior Notes [Member] | 4.625% Senior Notes Due 2021 (Existing Axiall 2021 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 63,207 | 63,207 | $ 688,000 |
Stated interest rate (percent) |  | 4.625% |  | 4.625% |
Exchange Offer Percentage | 99.9717% |  |  |  |
Senior Notes [Member] | 4.875% Senior Notes Due 2023 (Existing Axiall 2023 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 16,207 | $ 16,207 | $ 450,000 |
Stated interest rate (percent) |  | 4.875% |  | 4.875% |
Exchange Offer Percentage | 100.00% |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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