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Trade and other receivables (Details) - USD ($)
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets [Line Items]      
Trade $ 335,988,000   $ 343,959,000
Egypt insurance recovery 0 $ 60,000,000 50,000,000
Value-added and other tax receivables 22,903,000   44,408,000
Other 53,109,000   50,354,000
Trade and other receivables $ 412,000,000   488,721,000
Methanex      
Assets [Line Items]      
Egypt insurance recovery   $ 30,000,000 $ 25,000,000