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EMPLOYEE BENEFITS OBLIGATIONS - Plan Assets (Details) - CAD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Disclosure of fair value of plan assets [line items]    
Plan assets $ 623.9 $ 641.9
Canadian plans    
Disclosure of fair value of plan assets [line items]    
Private and property investments 164.8 80.2
Cash and cash equivalents 12.1 11.2
Other 0.8 0.5
Plan assets 617.1 574.7
Foreign plans    
Disclosure of fair value of plan assets [line items]    
Equity funds and instruments 2.6 2.6
Insured annuities 0.0 60.3
Other 0.6 0.6
Plan assets 6.8 67.2
Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Debt instruments 115.4 113.0
Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Debt instruments 105.7 104.3
Corporate | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Debt instruments 3.6 3.7
Quoted    
Disclosure of fair value of plan assets [line items]    
Plan assets 6.2 6.3
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 and instruments 2.6 2.6
Insured annuities 0.0 0.0
Other 0.0 0.0
Plan assets 6.2 6.3
Quoted | Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Debt instruments 0.0 0.0
Quoted | Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Debt instruments 0.0 0.0
Quoted | Corporate | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Debt instruments 3.6 3.7
Unquoted    
Disclosure of fair value of plan assets [line items]    
Plan assets 617.7 635.6
Unquoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Private and property investments 164.8 80.2
Cash and cash equivalents 12.1 11.2
Other 0.8 0.5
Plan assets 617.1 574.7
Unquoted | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Equity funds and instruments 0.0 0.0
Insured annuities 0.0 60.3
Other 0.6 0.6
Plan assets 0.6 60.9
Unquoted | Government | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Debt instruments 115.4 113.0
Unquoted | Corporate | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Debt instruments 105.7 104.3
Unquoted | Corporate | Foreign plans    
Disclosure of fair value of plan assets [line items]    
Debt instruments 0.0 0.0
Canadian | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds and instruments 72.9 78.2
Canadian | Quoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds and instruments 0.0 0.0
Canadian | Unquoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds and instruments 72.9 78.2
Foreign | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds and instruments 145.4 187.3
Foreign | Quoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds and instruments 0.0 0.0
Foreign | Unquoted | Canadian plans    
Disclosure of fair value of plan assets [line items]    
Equity funds and instruments $ 145.4 $ 187.3