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Redeemable preferred shares - Narrative (Details) - Series A Redeemable Convertible Preferred Stock - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 12 Months Ended
Oct. 05, 2018
Oct. 05, 2016
Mar. 18, 2021
Jan. 30, 2021
Feb. 01, 2020
Temporary Equity [Line Items]          
Redeemable convertible preferred stock, shares issued (in shares)   625,000      
Preferred stock, purchase price   $ 625.0      
Shares issued, price per share (in usd per share)   $ 1,000      
Payments of stock issuance costs   $ 13.7      
Accumulated accretion of dividends       $ 7.3 $ 5.7
Preferred stock, dividend rate, percentage       5.00%  
Percentage exceeding applicable conversion price 175.00%        
Threshold period at which shares can be converted 20 days        
Percentage of cash equal to the stated value       101.00%  
Preferred stock, increase in stated value per share (usd per share)       $ 37.97  
Subsequent Event          
Temporary Equity [Line Items]          
Preferred stock, increase in stated value per share (usd per share)     $ 12.97    
Maximum          
Temporary Equity [Line Items]          
Preferred dividends, percentage of average quarterly cash dividends (not more than)       130.00%