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Earnings per share
 9 Months Ended
Oct. 31, 2015
Earnings Per Share [Abstract]  
Earnings per share
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


The dilutive effect of share awards represents the potential impact of outstanding awards issued under the Company’s share-based compensation plans, including restricted shares and restricted stock units issued under the Omnibus Plan and stock options issued under the Share Saving Plans and the Executive Plans. The potential impact is calculated under the treasury stock method. The calculation of fully diluted earnings per share for the 13 and 39 weeks ended October 31, 2015 excludes share awards of 106,570 shares (13 and 39 weeks ended November 1, 2014: 525,561 and 32,504 share awards, respectively) on the basis that their effect would be anti-dilutive.