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Acquisitions (Narrative) (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 14, 2017
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire business |  | $ 0 | $ 1,325,759,000 | $ 25,394,000 |
Proceeds from issuance of Class A convertible preferred units, net |  | 0 | 726,419,000 | $ 0 |
Class A Convertible Preferred Stock Units |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Private placement of convertible preferred units | $ 750,000,000 |  |  |  |
Class A Convertible Preferred Stock Units | Private Placement |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Private placement of convertible preferred units | 750,000,000 |  |  |  |
6.500% senior unsecured notes |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Debt issued, aggregate principal amount |  | 550,000,000 | 550,000,000 |  |
Alkali Business |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire business | 1,325,000,000 |  |  |  |
Payment to acquire business, working capital | $ 105,000,000 |  |  |  |
Acquisition related costs |  | $ 2,000,000 | $ 12,000,000 |  |
Alkali Business | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful lives of property and equipment acquired | 2 years |  |  |  |
Alkali Business | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful lives of property and equipment acquired | 30 years |  |  |  |
Alkali Business | Class A Convertible Preferred Stock Units | Private Placement |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Private placement of convertible preferred units | $ 750,000,000 |  |  |  |
Proceeds from issuance of Class A convertible preferred units, net | 726,400,000 |  |  |  |
Alkali Business | 6.500% senior unsecured notes |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Debt issued, aggregate principal amount | $ 550,000,000 |  |  |  | $ 550,000,000
Debt instrument, stated rate | 6.50% |  |  |  | 6.50%
Proceeds from issuance of debt, net of discount | $ 540,100,000 |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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