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Long-term debt - Schedule (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 2,158,192,000 | $ 2,363,372,000
Less current maturities | (11,775,000) | (39,771,000)
Non-current portion of long-term debt | 2,146,417,000 | 2,323,601,000
Debt discounts and deferred financing fees | 21,800,000 | 25,400,000
Unsecured notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 1,981,199,000 | 1,979,125,000
$300 million at 4.25% due December 1, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 298,408,000 | 297,999,000
Notional amount | $ 300,000,000 |
$300 million at 4.25% due December 1, 2024 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 4.25% |
$700 million at 5.125% due October 15, 2027 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 692,516,000 | 691,434,000
Notional amount | $ 700,000,000 |
$700 million at 5.125% due October 15, 2027 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.125% |
$700 million at 5.25% due December 15, 2029 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 694,770,000 | 694,282,000
Notional amount | $ 700,000,000 |
$700 million at 5.25% due December 15, 2029 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.25% |
$300 million at 5.65% due December 1, 2044 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 295,505,000 | 295,410,000
Notional amount | $ 300,000,000 |
$300 million at 5.65% due December 1, 2044 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.65% |
Geismar 3 construction facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 0 | 176,335,000
Geismar 3 construction facility | LIBOR |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 3.00% |
Egypt limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 0 | 46,948,000
Other limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 176,993,000 | 160,964,000
5.58% due June 30, 2031 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 65,745,000 | 69,734,000
5.58% due June 30, 2031 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.58% |
5.35% due September 30, 2033 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 73,836,000 | 78,391,000
5.35% due September 30, 2033 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.35% |
5.08% due September 15, 2036 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 37,412,000 | $ 12,839,000
5.08% due September 15, 2036 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.08% |

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