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EMPLOYEE BENEFITS OBLIGATIONS - Plan Assets (Details) - CAD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of fair value of plan assets [line items]    
Plan assets $ 585.9 $ 542.0
Canadian plans    
Disclosure of fair value of plan assets [line items]    
Private and property investments 151.6 180.9
Cash and cash equivalents 14.6 9.9
Other 12.1 2.3
Plan assets 578.3 535.0
Foreign plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 0.4 2.5
Other 0.3 1.1
Plan assets 7.6 7.0
Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 135.3 117.4
Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 63.4 58.7
Corporate | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 6.9 3.4
Quoted    
Disclosure of fair value of plan assets [line items]    
Plan assets 7.3 5.9
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 0.4 2.5
Other 0.0 0.0
Plan assets 7.3 5.9
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 6.9 3.4
Unquoted    
Disclosure of fair value of plan assets [line items]    
Plan assets 578.6 536.1
Unquoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Private and property investments 151.6 180.9
Cash and cash equivalents 14.6 9.9
Other 12.1 2.3
Plan assets 578.3 535.0
Unquoted | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 0.0 0.0
Other 0.3 1.1
Plan assets 0.3 1.1
Unquoted | Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 135.3 117.4
Unquoted | Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 63.4 58.7
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 43.5 35.0
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 43.5 35.0
Foreign | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 157.8 130.8
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 $ 157.8 $ 130.8