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Segmented information - Business segments (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Operating Segments [Line Items]    
Revenue $ 1,862,925 $ 2,091,661
Cost of products and services sold 1,345,551 1,467,940
Depreciation and amortization 275,749 327,973
Cost of sales 1,621,300 1,795,913
Gross profit 241,625 295,748
Administration 124,869 141,552
Exploration 13,686 20,283
Research and development 6,058 1,757
Other operating expense 2,732 59,616
Loss on disposal of assets 1,869 2,303
Finance costs 98,622 111,779
Gain on derivatives (32,269) 81,081
Finance income (29,760) (22,071)
Share of earnings from equity-accounted investee (45,360) (32,321)
Other expense (income) (33,840) (108,160)
Earnings before income taxes 135,018 39,929
Income tax expense (recovery) 61,077 (126,306)
Net earnings 73,941 166,235
Capital expenditures for the year 75,211 55,362
Uranium [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 1,413,809 1,684,056
Cost of products and services sold 1,041,922 1,138,940
Depreciation and amortization 218,832 277,171
Cost of sales 1,260,754 1,416,111
Gross profit 153,055 267,945
Administration 0 0
Exploration 13,686 20,283
Research and development 0 0
Other operating expense 2,732 59,616
Loss on disposal of assets 1,869 1,008
Finance costs 0 0
Gain on derivatives 0 0
Finance income 0 0
Share of earnings from equity-accounted investee (45,360) (32,321)
Other expense (income) (52,801) (81,955)
Earnings before income taxes 232,929 301,314
Capital expenditures for the year 48,092 44,114
Fuel Service [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 370,277 313,989
Cost of products and services sold 234,423 219,240
Depreciation and amortization 45,856 35,977
Cost of sales 280,279 255,217
Gross profit 89,998 58,772
Administration 0 0
Exploration 0 0
Research and development 0 0
Other operating expense 0 0
Loss on disposal of assets 0 1,264
Finance costs 0 0
Gain on derivatives 0 0
Finance income 0 0
Share of earnings from equity-accounted investee 0 0
Other expense (income) 0 0
Earnings before income taxes 89,998 57,508
Capital expenditures for the year 27,117 11,226
Other Segment [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 78,839 93,616
Cost of products and services sold 69,206 109,760
Depreciation and amortization 11,061 14,825
Cost of sales 80,267 124,585
Gross profit (1,428) (30,969)
Administration 124,869 141,552
Exploration 0 0
Research and development 6,058 1,757
Other operating expense 0 0
Loss on disposal of assets 0 31
Finance costs 98,622 111,779
Gain on derivatives (32,269) 81,081
Finance income (29,760) (22,071)
Share of earnings from equity-accounted investee 0 0
Other expense (income) 18,961 (26,205)
Earnings before income taxes (187,909) (318,893)
Capital expenditures for the year $ 2 $ 22