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Capital Stock - Additional Information (Details)
 2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended 13 Months Ended
Dec. 31, 2017
USD ($)
vote / shares
shares
$ / shares
Jan. 28, 2015
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
vote / shares
shares
$ / shares
May 31, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
$ / shares
Dec. 31, 2017
USD ($)
vote / shares
shares
$ / shares
Dec. 31, 2017
USD ($)
vote / shares
shares
$ / shares
Dec. 31, 2017
USD ($)
vote / shares
shares
$ / shares
Dec. 31, 2017
USD ($)
vote / shares
shares
$ / shares
Dec. 31, 2017
USD ($)
vote / shares
shares
director
$ / shares
Dec. 31, 2016
USD ($)
shares
$ / shares
Dec. 31, 2015
USD ($)
shares
Feb. 28, 2017
shares
Nov. 30, 2017
shares
Feb. 29, 2016
shares
Sep. 30, 2015
$ / shares
Dec. 31, 2014
shares
Disclosure of classes of share capital [line items]                                    
Payment to repurchase and cancel shares | $                 $ 19,900,000     $ 34,300,000 $ 370,400,000          
Borrowings under credit facility | $                 0     40,000,000 275,000,000          
Employee stock-based compensation expense | $                 30,100,000     33,000,000 37,600,000          
Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise | $                 12.41     10.66            
Value of shares purchased | $                 $ 16,700,000     $ 18,200,000 $ 28,900,000          
Number of resigned directors | director                     2              
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                   100.00%                
Number of shares granted (in shares)               900,000       1,250,000 1,000,000          
Percentage of shares that will vest based on market performance condition and total shareholder return                   60.00%                
Premium used in estimating grant date fair value                   143.00%   109.00% 126.00%          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)               800,000   0   1,100,000 500,000          
Number of shares outstanding (in shares) 2,500,000   2,500,000     3,000,000 2,500,000 2,500,000 2,500,000 2,500,000 2,500,000 3,000,000 2,700,000          
Weighted average grant date fair value (in dollars per share) | $ $ 17.18   $ 17.18     $ 9.61 $ 17.18 $ 17.18 $ 17.18 $ 17.18 $ 17.18 $ 9.61 $ 13.06          
RSUs                                    
Disclosure of classes of share capital [line items]                                    
Vesting period             3 years                      
Number of shares granted (in shares)               1,900,000       2,300,000            
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)               2,300,000   0   1,900,000            
Number of shares outstanding (in shares) 3,200,000   3,200,000     3,800,000 3,200,000 3,200,000 3,200,000 3,200,000 3,200,000 3,800,000 3,500,000          
Weighted average grant date fair value (in dollars per share) | $ $ 13.05   $ 13.05     $ 9.29 $ 13.05 $ 13.05 $ 13.05 $ 13.05 $ 13.05 $ 9.29 $ 11.49          
DSUs                                    
Disclosure of classes of share capital [line items]                                    
Employee stock-based compensation expense | $                 $ 2,200,000     $ 2,100,000 $ 1,900,000          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)               14,098                    
Number of shares outstanding (in shares) 1,500,000   1,500,000     1,500,000 1,500,000 1,500,000 1,500,000 1,500,000 1,500,000 1,500,000 1,300,000          
Payments to settle DSUs as a result of a director's resignation | $                 $ 1,700,000                  
LTIP                                    
Disclosure of classes of share capital [line items]                                    
Number of shares granted (in shares)               1,400,000                    
LTIP | RSUs                                    
Disclosure of classes of share capital [line items]                                    
Number of shares granted (in shares)               1,400,000       800,000            
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)               300,000       0            
Number of shares outstanding (in shares) 1,700,000   1,700,000     800,000 1,700,000 1,700,000 1,700,000 1,700,000 1,700,000 800,000 0          
CSUP                                    
Disclosure of classes of share capital [line items]                                    
Number of shares granted (in shares)               1,100,000                    
CSUP | RSUs                                    
Disclosure of classes of share capital [line items]                                    
Number of shares granted (in shares)               500,000       1,500,000            
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)               2,000,000       1,900,000            
Number of shares outstanding (in shares) 1,500,000   1,500,000     3,000,000 1,500,000 1,500,000 1,500,000 1,500,000 1,500,000 3,000,000 3,500,000          
Bottom of range | PSUs                                    
Disclosure of classes of share capital [line items]                                    
Percentage of shares vested dependent on performance achievements                   0.00%                
Top of range | PSUs                                    
Disclosure of classes of share capital [line items]                                    
Percentage of shares vested dependent on performance achievements                   200.00%                
Term Loan                                    
Disclosure of classes of share capital [line items]                                    
Borrowings under credit facility | $         $ 250,000,000.0                          
Revolving Facility                                    
Disclosure of classes of share capital [line items]                                    
Borrowings under credit facility | $         25,000,000.0                          
2017 NCIB                                    
Disclosure of classes of share capital [line items]                                    
Percentage of outstanding shares authorized to be repurchased                             7.30%      
SIB                                    
Disclosure of classes of share capital [line items]                                    
Payment to repurchase and cancel shares | $         75,000,000.0                          
Subordinate voting shares                                    
Disclosure of classes of share capital [line items]                                    
Subordinate voting shares, number of votes per share | vote / shares 1   1       1 1 1 1 1              
Number of shares issued 123,200,000   123,200,000     121,900,000 123,200,000 123,200,000 123,200,000 123,200,000 123,200,000 121,900,000 124,500,000         155,600,000
Number of shares repurchased and cancelled (in shares)               1,900,000       3,200,000 32,400,000          
Number of shares purchased               1,400,000       1,600,000 2,500,000          
Value of shares purchased | $                 $ 16,700,000     $ 18,200,000 $ 28,900,000          
Number of shares acquired and held by broker               800,000       1,400,000 2,800,000          
Value of shares acquired and held by broker | $                 $ 8,700,000     $ 15,300,000 $ 31,400,000          
Subordinate voting shares | LTIP                                    
Disclosure of classes of share capital [line items]                                    
Number of shares authorized               29,000,000.0                    
Shares remaining in reserve for issuance 12,400,000   12,400,000       12,400,000 12,400,000 12,400,000 12,400,000 12,400,000              
Subordinate voting shares | 2017 NCIB                                    
Disclosure of classes of share capital [line items]                                    
Number of shares authorized to be repurchased                             10,500,000      
Payment to repurchase and cancel shares | $ $ 19,900,000                                  
Number of shares repurchased and cancelled (in shares) 1,900,000                                  
Shares repurchased     300,000         1,400,000                    
Subordinate voting shares | 2017 NCIB | Weighted average                                    
Disclosure of classes of share capital [line items]                                    
Share price (in dollars per share) | $ / shares $ 10.58   $ 10.58       $ 10.58 $ 10.58 $ 10.58 $ 10.58 $ 10.58              
Subordinate voting shares | 2016 NCIB                                    
Disclosure of classes of share capital [line items]                                    
Number of shares authorized to be repurchased                               10,500,000    
Payment to repurchase and cancel shares | $           $ 34,300,000                        
Number of shares repurchased and cancelled (in shares)           3,200,000                        
Shares repurchased               0       1,600,000   1,600,000        
Subordinate voting shares | 2016 NCIB | Weighted average                                    
Disclosure of classes of share capital [line items]                                    
Share price (in dollars per share) | $ / shares           $ 10.69           $ 10.69            
Subordinate voting shares | Program Share Repurchase, 2016 NCIB                                    
Disclosure of classes of share capital [line items]                                    
Number of shares repurchased and cancelled (in shares)       2,800,000                            
Subordinate voting shares | Program Share Repurchase, 2016 NCIB | Weighted average                                    
Disclosure of classes of share capital [line items]                                    
Share price (in dollars per share) | $ / shares       $ 10.69                            
Subordinate voting shares | Program Share Repurchase, 2017 NCIB                                    
Disclosure of classes of share capital [line items]                                    
Authorized amount to be repurchased | $       $ 30,000,000.0                            
Subordinate voting shares | SIB                                    
Disclosure of classes of share capital [line items]                                    
Payment to repurchase and cancel shares | $         $ 350,000,000                          
Number of shares repurchased and cancelled (in shares)         26,300,000                          
Share price (in dollars per share) | $ / shares         $ 13.30                          
Subordinate voting shares | 2014 NCIB                                    
Disclosure of classes of share capital [line items]                                    
Payment to repurchase and cancel shares | $                         $ 69,800,000          
Number of shares repurchased and cancelled (in shares)                         6,100,000          
Subordinate voting shares | 2014 NCIB | Weighted average                                    
Disclosure of classes of share capital [line items]                                    
Share price (in dollars per share) | $ / shares                                 $ 11.46  
Subordinate voting shares | Program Share Repurchase, 2014 NCIB                                    
Disclosure of classes of share capital [line items]                                    
Number of shares repurchased and cancelled (in shares)   4,400,000                                
Authorized amount to be repurchased | $   $ 50,000,000.0                                
Subordinate voting shares | Program Share Repurchase, 2014 NCIB | Weighted average                                    
Disclosure of classes of share capital [line items]                                    
Share price (in dollars per share) | $ / shares   $ 11.38                                
Multiple voting shares                                    
Disclosure of classes of share capital [line items]                                    
Subordinate voting shares, number of votes per share | vote / shares 25   25       25 25 25 25 25              
Number of shares issued 18,600,000   18,600,000     18,900,000 18,600,000 18,600,000 18,600,000 18,600,000 18,600,000 18,900,000 18,900,000         18,900,000
Number of shares repurchased and cancelled (in shares)               0       0 0          
Preferred shares                                    
Disclosure of classes of share capital [line items]                                    
Number of shares issued 0   0       0 0 0 0 0