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Redeemable preferred shares (Tables)
3 Months Ended
May 04, 2019
Temporary Equity [Abstract]  
Redeemable Preferred Shares
(in millions, except conversion rate and conversion price)
May 4, 2019
 
February 2, 2019
 
May 5, 2018
Conversion rate
11.5493

 
11.3660

 
10.9409

Conversion price
$
86.5853

 
$
87.9817

 
$
91.4002

Potential impact of preferred shares if-converted to common shares
7.2

 
7.1

 
6.8

Liquidation preference
$
632.8

 
$
632.8

 
$
632.8