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Common shares (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 18, 2020
Aug. 24, 2020
May 01, 2020
Apr. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Mar. 25, 2020
Common shares              
Common Stock, No Par Value         $ 0 $ 0  
Common Stock, Shares Authorized, Unlimited         Unlimited Unlimited  
Common Stock, Shares, Issued         89,222,568 108,675,294  
Common Stock, Shares, Outstanding         89,222,568 108,675,294  
Stock Repurchase Program              
Shares repurchased and canceled         $ 41.6 $ 2.5  
Future Shelf Registration Period Available   3 years          
Shelf Registration, Authorized Amount   $ 250.0          
Normal Course Issuer Bid [Member]              
Stock Repurchase Program              
Public float amount used to determine share amount, percent 10.00%            
Shares repurchased and canceled         $ 15.8    
Shares repurchased and canceled (in shares)         7,540,105    
Normal Course Issuer Bid [Member] | Maximum              
Stock Repurchase Program              
Number of shares authorized for repurchase         8,554,391    
Number of shares that may be purchased per day         10,420    
SIB              
Stock Repurchase Program              
Number of shares authorized for repurchase             12,820,512
Shares repurchased and canceled     $ 25.8 $ 25.8      
Shares repurchased and canceled (in shares)     12,500,000 12,500,000      
Stock Repurchase Program, Authorized Amount             $ 25.0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased As Percentage Of Common Stock Issued And Outstanding             12.00%
Share Price     $ 2.00       $ 1.95
Share Price, Increment             0.05
SIB | Maximum              
Stock Repurchase Program              
Share Price             2.20
SIB | Minimum              
Stock Repurchase Program              
Share Price             $ 1.95