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Revenue - Future sales commitments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
CAD ($)
Reportable Segments Member  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations $ 3,123,998
USD/CAD average foreign exchange rate 1.3
Reportable Segments Member | 2020 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations $ 550,427
Reportable Segments Member | 2021 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 452,760
Reportable Segments Member | 2022 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 358,482
Reportable Segments Member | 2023 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 319,500
Reportable Segments Member | 2024 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 316,788
Reportable Segments Member | Thereafter [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 1,126,041
Uranium [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 1,468,662
Uranium [Member] | 2020 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 271,642
Uranium [Member] | 2021 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 183,422
Uranium [Member] | 2022 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 145,920
Uranium [Member] | 2023 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 169,234
Uranium [Member] | 2024 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 166,015
Uranium [Member] | Thereafter [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 532,429
Fuel Services [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 1,647,094
Fuel Services [Member] | 2020 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 274,755
Fuel Services [Member] | 2021 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 265,126
Fuel Services [Member] | 2022 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 212,562
Fuel Services [Member] | 2023 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 150,266
Fuel Services [Member] | 2024 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 150,773
Fuel Services [Member] | Thereafter [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 593,612
Other Segment [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 8,242
Other Segment [Member] | 2020 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 4,030
Other Segment [Member] | 2021 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 4,212
Other Segment [Member] | 2022 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 0
Other Segment [Member] | 2023 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 0
Other Segment [Member] | 2024 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 0
Other Segment [Member] | Thereafter [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations $ 0