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Long-term debt - Schedule (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 2,363,372,000 | $ 1,768,853,000
Less current maturities | (39,771,000) | (38,420,000)
Non-current portion of long-term debt | 2,323,601,000 | 1,730,433,000
Debt discounts and deferred financing fees | 25,400,000 | 20,400,000
Unsecured notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 1,979,125,000 | 1,535,662,000
$250 million at 5.25% due March 1, 2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 0 | 248,912,000
Notional amount | $ 250,000,000 |
$250 million at 5.25% due March 1, 2022 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.25% |
$300 million at 4.25% due December 1, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 297,999,000 | 297,607,000
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 | $ 691,434,000 | 0
Notional amount | $ 700,000,000 |
Interest rate | 5.125% |
$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 | $ 694,282,000 | 693,822,000
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 | $ 295,410,000 | 295,321,000
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 | $ 176,335,000 | 0
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 | $ 46,948,000 | 75,165,000
Egypt limited recourse debt facilities | LIBOR | Bottom of range |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 1.60% |
Egypt limited recourse debt facilities | LIBOR | Top of range |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 1.90% |
Other limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 160,964,000 | 158,026,000
LIBOR Plus 0.75% to LIBOR Plus 2.5% due 2019 to 2021 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 0 | 1,526,000
LIBOR Plus 0.75% to LIBOR Plus 2.5% due 2019 to 2021 | LIBOR | Bottom of range |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 0.75% |
LIBOR Plus 0.75% to LIBOR Plus 2.5% due 2019 to 2021 | LIBOR | Top of range |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 2.50% |
5.58% due June 30, 2031 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 69,734,000 | 73,700,000
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 | $ 78,391,000 | 82,800,000
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 | $ 12,839,000 | $ 0
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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