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EMPLOYEE BENEFITS OBLIGATIONS - Significant Assumptions (Details)
$ in Millions
Mar. 31, 2023
CAD ($)
Disclosure of defined benefit plans [line items]  
Change in significant assumptions (in percent) 0.25%
Discount rate  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate $ (25.4)
Increase (decrease) in compensation rate 26.9
Compensation rate  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate 8.7
Increase (decrease) in compensation rate (8.3)
Canadian | Discount rate | Funded plans  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate (22.7)
Increase (decrease) in compensation rate 24.1
Canadian | Discount rate | Unfunded plans  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate (2.3)
Increase (decrease) in compensation rate 2.4
Canadian | Compensation rate | Funded plans  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate 8.4
Increase (decrease) in compensation rate (8.0)
Canadian | Compensation rate | Unfunded plans  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate 0.3
Increase (decrease) in compensation rate (0.3)
Foreign | Discount rate | Funded plans  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate (0.1)
Increase (decrease) in compensation rate 0.1
Foreign | Discount rate | Unfunded plans  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate (0.3)
Increase (decrease) in compensation rate 0.3
Foreign | Compensation rate | Funded plans  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate 0.0
Increase (decrease) in compensation rate 0.0
Foreign | Compensation rate | Unfunded plans  
Disclosure of defined benefit plans [line items]  
Increase (decrease) in discount rate 0.0
Increase (decrease) in compensation rate $ 0.0