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Share Capital (Tables)
 12 Months Ended
Dec. 31, 2021
Share-Based Payment Arrangements [Abstract]  
Summary of Dividends Declared and Recorded The table below describes the dividends paid in 2021.
Date DeclaredRecord DatePayment DateDividend per Share
$		Paid
$
November 4, 2020December 31, 2020January 15, 20210.155 17.2 
February 24, 2021March 31, 2021April 15, 20210.165 18.4 
May 5, 2021June 30, 2021July 15, 20210.165 18.3 
August 4, 2021September 30, 2021October 15, 20210.165 18.4 
November 3, 2021December 31, 2021January 18, 20220.165 — 
Number of Shares and Weighted Average Exercise Price of Share Options
For the year ended
December 31,
2021
For the year ended
December 31,
2020
Shares
#		Weighted Average
Exercise Price
per Share
$		Shares
#		Weighted Average
Exercise Price
per Share
$
Share options outstanding, beginning of the year2,123,800 32.45 4,051,080 32.17 
Exercised(1,267,614)32.50 (1,840,320)31.83 
Forfeited(7,908)32.98 (86,960)32.58 
Share options outstanding, end of the year848,278 32.37 2,123,800 32.45 
Share options vested, end of the year848,278 32.37 1,816,592 32.36 
These options are held by officers and employees, expire on dates between March 3, 2022 and May 15, 2023, and can be exercised between a range of price per share of $31.75 - $32.98. The weighted average remaining contractual life is 0.78 year.
Summary of the Company's RSUs, PSUs, and DSUs
A summary of the Company’s RSUs, PSUs, and DSUs is as follows:

December 31, 2021December 31, 2020
RSUs
#		PSUs
#		DSUs
#		RSUs
#		PSUs
#		DSUs
#
Units, beginning of year289,180 869,337 163,249 164,704 875,739 275,950 
Granted128,579 251,120 37,162 142,043 320,256 37,147 
Paid— (235,373)— — (234,966)(149,848)
Forfeited(10,997)(23,052)— (17,567)(91,692)— 
Units, end of year406,762 862,032 200,411 289,180 869,337 163,249 

The Company entered into total return swaps for a portion of its RSUs and DSUs to offset its exposure to the change in common share price (note 25).