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Share Capital - Summary of Dividends Declared and Recorded in the Consolidated Financial Statements (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
$ / shares
Dividends per share one [member]  
Disclosure of Dividends [line items]  
Dividend per Share $ 0.1375
Paid | $ $ 15.7
Date Declared Feb. 21, 2018
Record Date Mar. 29, 2018
Payment Date Apr. 12, 2018
Dividends per share two [member]  
Disclosure of Dividends [line items]  
Dividend per Share $ 0.1375
Paid | $ $ 15.6
Date Declared May 09, 2018
Record Date Jun. 29, 2018
Payment Date Jul. 12, 2018
Dividends per share three [member]  
Disclosure of Dividends [line items]  
Dividend per Share $ 0.1375
Paid | $ $ 15.7
Date Declared Aug. 07, 2018
Record Date Sep. 28, 2018
Payment Date Oct. 11, 2018
Dividends per share four [member]  
Disclosure of Dividends [line items]  
Dividend per Share $ 0.1375
Date Declared Nov. 07, 2018
Record Date Dec. 28, 2018
Payment Date Jan. 10, 2019