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Revenue - Future sales commitments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
CAD ($)
Reportable Segments Member  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations $ 3,243,838
USD/CAD average foreign exchange rate 1.3
Reportable Segments Member | 2021 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations $ 567,132
Reportable Segments Member | 2022 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 462,271
Reportable Segments Member | 2023 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 391,867
Reportable Segments Member | 2024 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 382,310
Reportable Segments Member | 2025 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 345,700
Reportable Segments Member | Thereafter [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 1,094,558
Uranium [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 1,324,610
Uranium [Member] | 2021 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 243,069
Uranium [Member] | 2022 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 189,351
Uranium [Member] | 2023 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 179,212
Uranium [Member] | 2024 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 166,581
Uranium [Member] | 2025 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 129,450
Uranium [Member] | Thereafter [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 416,947
Fuel Services [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 1,915,016
Fuel Services [Member] | 2021 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 319,851
Fuel Services [Member] | 2022 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 272,920
Fuel Services [Member] | 2023 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 212,655
Fuel Services [Member] | 2024 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 215,729
Fuel Services [Member] | 2025 [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 216,250
Fuel Services [Member] | Thereafter [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 677,611
Other Segment [Member]  
Disclosure of transaction price allocated to remaining performance obligations [Line Items]  
Transaction Price Allocated To Remaining Performance Obligations 4,212
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] | 2025 [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