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Acquisition (Allocation of Purchase Consideration) (Details) - Axiall Corporation [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | Aug. 31, 2016 | Aug. 30, 2016
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Business Acquisition [Line Items] |  |
Offer per share | $ 33.00 |
Multiplied by number of shares outstanding at acquisition | 67,277 |
Fair value of Axiall shares outstanding purchased by the Company | $ 2,220,141 |
Axiall debt repaid at acquisition | 247,135 |
Seller's transaction costs paid by the Company | 47,458 |
Total fair value of consideration transferred | 2,514,734 |
Fair value of Axiall share-based awards attributed to pre-combination service | 11,346 |
Additional settlement value of shares acquired | 13,280 |
Purchase consideration | 2,539,360 |
Fair value of previously held equity interest in Axiall | 102,300 |
Total fair value allocated to net assets acquired | 2,641,660 |
Equity interest in acquiree held prior to combination, shares |  | 3,100
Step acquisition, equity interest in acquiree, remeasurement gain (loss), net | $ 49,080 |

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