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Redeemable preferred shares (Tables)
 6 Months Ended
Aug. 04, 2018
Temporary Equity [Abstract]  
Redeemable Preferred Shares
(in millions, except conversion rate and conversion price)
August 4, 2018
 
February 3, 2018
 
July 29, 2017
Conversion rate
11.1190

 
10.9409

 
10.7707

Conversion price
$
89.9361

 
$
91.4002

 
$
92.8445

Potential impact of preferred shares if-converted to common shares
6.9

 
6.8

 
6.7

Liquidation preference
$
632.8

 
$
632.8

 
$
632.8