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Redeemable preferred shares (Tables)
6 Months Ended
Aug. 03, 2019
Temporary Equity [Abstract]  
Redeemable Preferred Shares
(in millions, except conversion rate and conversion price)
August 3, 2019
 
February 2, 2019
 
August 4, 2018
Conversion rate
11.7898

 
11.3660

 
11.1190

Conversion price
$
84.8191

 
$
87.9817

 
$
89.9361

Potential impact of preferred shares if-converted to common shares
7.4

 
7.1

 
6.9

Liquidation preference
$
632.8

 
$
632.8

 
$
632.8