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EMPLOYEE BENEFITS OBLIGATIONS - Plan Assets (Details) - CAD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Disclosure of fair value of plan assets [line items]    
Plan assets $ 641.7 $ 623.9
Canadian plans    
Disclosure of fair value of plan assets [line items]    
Private and property investments 191.7 164.8
Cash and cash equivalents 14.4 12.1
Other 1.1 0.8
Plan assets 635.3 617.1
Foreign plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 2.3 2.6
Other 0.8 0.6
Plan assets 6.4 6.8
Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 133.3 115.4
Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 74.4 105.7
Corporate | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 3.3 3.6
Quoted    
Disclosure of fair value of plan assets [line items]    
Plan assets 5.6 6.2
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 2.3 2.6
Other 0.0 0.0
Plan assets 5.6 6.2
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 3.3 3.6
Unquoted    
Disclosure of fair value of plan assets [line items]    
Plan assets 636.1 617.7
Unquoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Private and property investments 191.7 164.8
Cash and cash equivalents 14.4 12.1
Other 1.1 0.8
Plan assets 635.3 617.1
Unquoted | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 0.0 0.0
Other 0.8 0.6
Plan assets 0.8 0.6
Unquoted | Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 133.3 115.4
Unquoted | Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Bond funds 74.4 105.7
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 45.6 72.9
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 45.6 72.9
Foreign | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds 174.8 145.4
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 $ 174.8 $ 145.4