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Debt (Senior Unsecured Notes) (Details) - USD ($) |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2018 | Dec. 11, 2017 | Sep. 01, 2017 | Aug. 14, 2017 | Jul. 23, 2015 | May 21, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 15, 2014 | Feb. 08, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption of senior unsecured debt |  |  |  |  |  |  | $ 145,170,000 | $ 204,830,000 | $ 0 |  |
Loss on extinguishment of debt | $ 3,300,000 |  |  |  |  |  | 3,339,000 | 6,242,000 | 0 |  |
Proceeds from issuance of unsecured debt |  |  |  |  |  |  | 0 | 1,000,000,000 | $ 0 |  |
Debt percentage of principal amount redeemed | 101.438% |  |  |  |  |  |  |  |  |  |
2021 Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  | 0 | 145,170,000 |  |  | $ 350,000,000
Debt instrument, stated rate |  |  |  |  |  |  |  |  |  |  | 5.75%
Proceeds used to repay unsecured debt principal |  | $ 204,800,000 |  |  |  |  |  |  |  |  |
2026 Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  | $ 450,000,000 |  |  |  |  | 450,000,000 | 450,000,000 |  |  |
Debt instrument, stated rate |  | 6.25% |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discount |  | $ 441,800,000 |  |  |  |  |  |  |  |  |
2024 Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  | 350,000,000 | 350,000,000 |  | $ 350,000,000 |
Debt instrument, stated rate |  |  |  |  |  |  |  |  |  | 5.625% |
2023 Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  | $ 400,000,000 | 400,000,000 | 400,000,000 |  |  |
Debt instrument, stated rate |  |  |  |  |  | 6.00% |  |  |  |  |
7.875% senior unsecured notes due 2018 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  |  | 7.875% |  |  |  |  |
Redemption of senior unsecured debt |  |  |  |  |  | $ 350,000,000 |  |  |  |  |
2022 Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  | 750,000,000 | 750,000,000 |  |  |
2022 Notes | Enterprise Offshore Acquisition |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  | $ 750,000,000 |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  | 6.75% |  |  |  |  |  |
Proceeds from issuance of debt, net of discount |  |  |  |  | $ 728,600,000 |  |  |  |  |  |
2025 Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  | $ 550,000,000 | $ 550,000,000 |  |  |
2025 Notes | Alkali Business |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  | $ 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 |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt |  |  |  | $ 540,100,000 |  |  |  |  |  |  |

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