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Guarantees and Contingencies (Details)
CAD in Millions, $ in Millions
3 Months Ended 5 Months Ended
Apr. 27, 2017
CAD
Sep. 30, 2017
CAD
item
Sep. 30, 2017
USD ($)
Jun. 30, 2017
CAD
Jun. 30, 2017
USD ($)
Sep. 30, 2017
CAD
item
Contingencies            
Number of pending matters expected to have a material adverse impact on financial position or results of operations, or have been reserved | item   0       0
Ontario Electricity Financial Corporation            
Contingencies            
Litigation settlement amount CAD 36.4         CAD 37.8
Ontario Electricity Financial Corporation | Revenue            
Contingencies            
Payment received against litigation settlement   CAD 34.0 $ 25.6 CAD 34.0 $ 25.6  
Ontario Electricity Financial Corporation | North Bay And Kapuskasing | Application Of Price Escalator To Enhanced Dispatch Contracts            
Contingencies            
Balance of litigation settlement receivable   CAD 3.8       CAD 3.8