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Redeemable preferred shares (Tables)
9 Months Ended
Oct. 31, 2020
Temporary Equity [Abstract]  
Redeemable Preferred Shares
(in millions, except conversion rate and conversion price)October 31, 2020February 1, 2020November 2, 2019
Conversion rate
12.2297 12.2297 12.0578 
Conversion price
$81.7682 $81.7682 $82.9339 
Potential impact of preferred shares if-converted to common shares
7.8 7.6 7.5 
Liquidation preference
$648.7 $632.8 $632.8