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Discontinued Operations (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of analysis of single amount of discontinued operations [line items]    
Income before income taxes and discontinued operations $ 216.7 $ 265.5
Net income from discontinued operations 12.0 0.0
Discontinued operations    
Disclosure of analysis of single amount of discontinued operations [line items]    
Revenue 3.7 9.7
Expenses (3.7) (10.8)
Project loss recovery 12.8 0.0
Income before income taxes and discontinued operations 12.8 (1.1)
Income taxes on operating activities (0.8) 0.3
Profit (loss) from operating activities, net of income taxes 12.0 (0.8)
Gain on disposal of discontinued operations before income taxes 0.0 1.9
Income taxes on disposal of discontinued operations 0.0 (1.1)
Gain on disposal of discontinued operations, net of income taxes 0.0 0.8
Net income from discontinued operations $ 12.0 $ 0.0