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Debt (Senior Unsecured Notes) (Details) - USD ($) |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 19, 2021 | Dec. 17, 2020 | Feb. 16, 2020 | Jan. 16, 2020 | Dec. 11, 2017 | Aug. 14, 2017 | Jul. 23, 2015 | May 21, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 15, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption of debt |  |  |  |  |  |  |  |  | $ 1,185,096,000 | $ 0 | $ 145,170,000 |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 31,730,000 | 0 | 3,339,000 |
Cancellation of debt income |  |  |  |  |  |  |  |  | $ 27,302,000 | $ 0 | $ 0 |
2024 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 562.50% |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 600.00% |  |  |
2027 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 800.00% |  |  |
2022 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 675.00% |  |  |
2025 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 650.00% |  |  |
2026 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 625.00% |  |  |
2028 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 775.00% |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption of debt |  |  |  |  |  |  |  |  | $ 153,600,000 |  |  |
Cancellation of debt income |  |  |  |  |  |  |  |  | $ 27,300,000 |  |  |
Redemption percentage of debt with proceeds from equity |  |  |  |  |  |  |  |  | 35.00% |  |  |
Senior Unsecured Notes | 2024 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000
Debt interest rate |  |  |  |  |  |  |  |  |  |  |  | 5.625%
Redemption percentage of debt with proceeds from equity |  |  |  |  |  |  |  |  | 35.00% |  |  |
Senior Unsecured Notes | 2023 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
Debt interest rate |  | 6.00% |  |  |  |  |  | 6.00% |  |  |  |
Redemption of debt |  | $ 316,500,000 |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | $ 8,200,000 |  |  |
Debt tendered and repaid |  | 308,800,000 |  |  |  |  |  |  |  |  |  |
Redemption percentage of debt with proceeds from equity |  |  |  |  |  |  |  |  | 35.00% |  |  |
Senior Unsecured Notes | 2023 Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption of debt | $ 80,900,000 |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 7.875% senior unsecured notes due 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  | 7.875% |  |  |  |
Redemption of debt |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |
Senior Unsecured Notes | 2027 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 8.00% |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discount |  | $ 737,000,000 |  |  |  |  |  |  |  |  |  |
Redemption percentage of debt with proceeds from equity |  |  |  |  |  |  |  |  | 35.00% |  |  |
Senior Unsecured Notes | 2022 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |
Debt interest rate |  |  |  | 6.75% |  |  | 6.75% |  |  |  |  |
Redemption of debt |  |  | $ 222,100,000 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | $ 23,500,000 |  |  |
Proceeds from issuance of debt, net of discount |  |  |  |  |  |  | $ 728,600,000 |  |  |  |  |
Debt tendered and repaid |  |  |  | $ 554,800,000 |  |  |  |  |  |  |  |
Senior Unsecured Notes | 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption percentage of debt with proceeds from equity |  |  |  |  |  |  |  |  | 35.00% |  |  |
Senior Unsecured Notes | 2025 Notes | Alkali Business |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  | $ 550,000,000 |  |  |  |  |  |
Debt interest rate |  |  |  |  |  | 6.50% |  |  |  |  |  |
Proceeds from issuance of debt, net of discount |  |  |  |  |  | $ 540,100,000 |  |  |  |  |  |
Senior Unsecured Notes | 2026 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 6.25% |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discount |  |  |  |  | $ 441,800,000 |  |  |  |  |  |  |
Redemption percentage of debt with proceeds from equity |  |  |  |  |  |  |  |  | 35.00% |  |  |
Senior Unsecured Notes | 2021 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 5.75% |  |  |  |  |  |  |
Redemption of debt |  |  |  |  | $ 204,800,000 |  |  |  |  |  |  |
Senior Unsecured Notes | 2028 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |
Debt interest rate |  |  |  | 7.75% |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discount |  |  |  | $ 736,700,000 |  |  |  |  |  |  |  |

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