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Share Capital (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Dividends Declared and Recorded in the Consolidated Financial Statements

The table below describes the dividends declared and recorded in the consolidated financial statements in 2018.

                   Dividend per Share                        Paid  
Date Declared    Record Date    Payment Date    $    $  

February 21, 2018

    March 29, 2018    April 12, 2018    0.1375      15.7  

May 9, 2018

    June 29, 2018    July 12, 2018    0.1375      15.6  

August 7, 2018

    September 28, 2018    October 11, 2018    0.1375      15.7  

November 7, 2018

    December 28, 2018    January 10, 2019    0.1375      -  
Summary of Granted Share Options

The Company has granted share options to officers and employees to purchase 4,987,542 shares at prices from $14.88 to $32.98 per share. These options expire on dates between February 28, 2019, and May 15, 2023.

 

    For the year ended     For the year ended  
    December 31     December 31  
    2018     2017  
          Weighted Average           Weighted Average  
          Exercise Price           Exercise Price  
    Shares     per Share     Shares     per Share  
     #     $     #     $  

Share options, beginning of the year

         4,426,237       29.84           3,655,020       28.33  

Granted

     1,112,779       32.98       1,229,689       31.75  

Exercised

     (338,989 )      20.40       (376,160 )      21.09  

Forfeited

     (212,485 )      31.49       (82,312 )      31.57  

Share options, end of the year

     4,987,542       31.11       4,426,237       29.84  
Summary of Outstanding Share Options

The options held by officers and employees at December 31, 2018, were as follows:

 

Options Outstanding        Options Exercisable
            Weighted                Weighted
        Weighted   Average            Weighted   Average
        Average   Exercise            Average   Exercise
Range of Exercise       Remaining   Price per        Shares   Remaining   Price per
Prices per Share   Outstanding   Contractual   Share        Exercisable   Contractual   Share
$   #   Life in Years   $        #   Life in Years   $
14.88   142,540   0.16   14.88               142,540   0.16   14.88
20.88   364,526   1.16   20.88        364,526   1.16   20.88

31.75 – 32.98

   4,480,476   3.21   32.46      2,401,323   2.75   32.40

14.88 – 32.98

   4,987,542   2.98   31.11      2,908,389   2.43   30.10
Summary of Weighted Average Assumptions

The estimated fair value of options granted at the share market price on the grant date was $5.73 per share (2017 – $5.03) and was determined using the weighted average assumptions indicated below:

                                 2018                          2017  

Volatility in the price of the Company’s shares (%)

      24.12        24.13  

Risk-free interest rate (%)

      2.10        0.81  

Expected hold period to exercise (years)

      3.50        3.50  

Dividend yield (%)

      1.668        1.575  

Exercise price ($)

      32.98        31.75  
Summary of Non-Vested Options

A summary of the status of the Company’s non-vested options as at December 31, 2018, and of changes in the year are as follows:

 

     Number of Shares
Subject to Option		    

    Weighted Average
Grant Date

Fair Value

per Share

  
     #     $  

Non-vested share options, beginning of the year

      2,139,320       5.28  

Granted

      1,112,779       5.73  

Vested

      (1,000,441 )      5.24  

Forfeited

      (172,505 )      5.40  
     

Non-vested share options, end of the year

      2,079,153       5.53