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EMPLOYEE BENEFITS OBLIGATIONS - Plan Assets (Details) - CAD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Disclosure of fair value of plan assets [line items]    
Plan assets $ 542.0 $ 641.7
Canadian plans    
Disclosure of fair value of plan assets [line items]    
Private and property investments 180.9 191.7
Cash and cash equivalents 9.9 14.4
Other 2.3 1.1
Plan assets 535.0 635.3
Foreign plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 2.5 2.3
Other 1.1 0.8
Plan assets 7.0 6.4
Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 117.4 133.3
Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 58.7 74.4
Corporate | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 3.4 3.3
Quoted    
Disclosure of fair value of plan assets [line items]    
Plan assets 5.9 5.6
Quoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Private and property investments 0.0 0.0
Cash and cash equivalents 0.0 0.0
Other 0.0 0.0
Plan assets 0.0 0.0
Quoted | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 2.5 2.3
Other 0.0 0.0
Plan assets 5.9 5.6
Quoted | Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 0.0 0.0
Quoted | Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 0.0 0.0
Quoted | Corporate | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 3.4 3.3
Unquoted    
Disclosure of fair value of plan assets [line items]    
Plan assets 536.1 636.1
Unquoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Private and property investments 180.9 191.7
Cash and cash equivalents 9.9 14.4
Other 2.3 1.1
Plan assets 535.0 635.3
Unquoted | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 0.0 0.0
Other 1.1 0.8
Plan assets 1.1 0.8
Unquoted | Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 117.4 133.3
Unquoted | Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 58.7 74.4
Unquoted | Corporate | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 0.0 0.0
Canadian | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 35.0 45.6
Canadian | Quoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 0.0 0.0
Canadian | Unquoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 35.0 45.6
Foreign | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 130.8 174.8
Foreign | Quoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 0.0 0.0
Foreign | Unquoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds $ 130.8 $ 174.8