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Earnings per share (Tables)
 9 Months Ended
Oct. 31, 2015
Earnings Per Share [Abstract]  
Earnings per share
 
13 weeks ended
 
39 weeks ended
(in millions, except per share amounts)
October 31, 2015
 
November 1, 2014
 
October 31, 2015
 
November 1, 2014
Net income (loss)
$
15.0

 
$
(1.3
)
 
$
196.0

 
$
153.3

Basic weighted average number of shares outstanding
79.3

 
79.9

 
79.7

 
79.9

Dilutive effect of share awards
0.2

 
—

 
0.2

 
0.3

Diluted weighted average number of shares outstanding
79.5

 
79.9

 
79.9

 
80.2

Earnings (loss) per share – basic
$
0.19

 
$
(0.02
)
 
$
2.46

 
$
1.92

Earnings (loss) per share – diluted
$
0.19

 
$
(0.02
)
 
$
2.45

 
$
1.91