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Capital Stock - Additional Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Apr. 26, 2020
Dec. 31, 2019
shares
vote / shares
Dec. 31, 2018
shares
Dec. 31, 2017
USD ($)
shares
Jan. 29, 2020
shares
Nov. 30, 2018
shares
Dec. 31, 2016
shares
Disclosure of classes of share capital [line items]              
Number of share options granted in share-based payment arrangement (in shares)   0 0        
Performance period   3 years          
DSUs              
Disclosure of classes of share capital [line items]              
Conversion rate (in shares)   1          
Payments to settle DSUs as a result of a director's resignation | $       $ 1.7      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)       14,098      
Options              
Disclosure of classes of share capital [line items]              
Expiration period   10 years          
Vesting period   4 years          
PSUs              
Disclosure of classes of share capital [line items]              
Vesting period   3 years          
Percentage of shares vested dependent on performance achievements (percent)   100.00%          
Premium used in estimating grant date fair value (percent)   102.00% 106.00% 143.00%      
Percentage of shares that will vest based on market performance condition and total shareholder return (percent)       60.00%      
Award requisite service period   3 years          
RSUs              
Disclosure of classes of share capital [line items]              
Conversion rate (in shares)   1          
Vesting period   3 years          
Bottom of range | PSUs              
Disclosure of classes of share capital [line items]              
Percentage of shares vested dependent on performance achievements (percent)   0.00%          
Top of range | PSUs              
Disclosure of classes of share capital [line items]              
Percentage of shares vested dependent on performance achievements (percent)   200.00%          
Subordinate voting shares              
Disclosure of classes of share capital [line items]              
Subordinate voting shares, number of votes per share | vote / shares   1          
Conversion rate (in shares)   1          
Number of shares issued (in shares)   110,200,000 117,700,000 123,200,000     121,900,000
Number of shares of SVS holder of vested PSU or RSU unit is entitled to (in shares)   1          
Subordinate voting shares | LTIP              
Disclosure of classes of share capital [line items]              
Number of shares authorized (in shares)   29,000,000          
Shares remaining in reserve for issuance (in shares)   10,300,000          
Subordinate voting shares | Two Thousand Eighteen NCIB              
Disclosure of classes of share capital [line items]              
Number of shares authorized to be repurchased (in shares)   9,500,000          
Subordinate voting shares | 2017 NCIB              
Disclosure of classes of share capital [line items]              
Number of shares authorized to be repurchased (in shares)           10,500,000  
Multiple voting shares              
Disclosure of classes of share capital [line items]              
Subordinate voting shares, number of votes per share | vote / shares   25          
Number of shares issued (in shares)   18,600,000 18,600,000 18,600,000     18,900,000
Preferred shares              
Disclosure of classes of share capital [line items]              
Number of shares issued (in shares)   0          
Retirement of the chairman of the board of directors | Other related parties | Mr. William A. Etherington | DSUs              
Disclosure of classes of share capital [line items]              
Number of shares owned by Mr. Etherington (in shares)         470,000    
Award requisite service period 90 days