XML 185 R87.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Discontinued Operations - Summary of Net Loss from Discontinued Operations (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of analysis of single amount of discontinued operations [line items]    
Revenue $ 4,827.3 $ 4,283.8
Income before income taxes and discontinued operations 265.5 226.3
Net loss from discontinued operations   (123.9)
Discontinued operations [member] | Construction services group [member]    
Disclosure of analysis of single amount of discontinued operations [line items]    
Revenue 9.7 884.4
Expenses (10.8) (953.8)
Impairment of goodwill   (53.0)
Income before income taxes and discontinued operations (1.1) (122.4)
Income taxes on operating activities 0.3 10.8
Loss from operating activities, net of income taxes (0.8) (111.6)
Gain on disposal of discontinued operations before income taxes 1.9 1.5
Income taxes on disposal of discontinued operations (1.1) (13.8)
Gain (Loss) on disposal of discontinued operations, net of income taxes $ 0.8 (12.3)
Net loss from discontinued operations   $ (123.9)