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Pension plans (Tables)
 9 Months Ended
Oct. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic pension cost for the UK Plan are as follows:
 
13 weeks ended
 
39 weeks ended
(in millions)
October 31, 2015
 
November 1, 2014
 
October 31, 2015
 
November 1, 2014
Components of net periodic pension benefit (cost):
 
 
 
 
 
 
 
Service cost
$
(0.7
)
 
$
(0.6
)
 
$
(2.0
)
 
$
(1.8
)
Interest cost
(1.9
)
 
(2.4
)
 
(5.8
)
 
(7.4
)
Expected return on UK Plan assets
2.9

 
3.7

 
8.7

 
11.2

Amortization of unrecognized net prior service credits
0.6

 
0.4

 
1.7

 
1.3

Amortization of unrecognized actuarial losses
(0.9
)
 
(0.5
)
 
(2.6
)
 
(1.5
)
Net periodic pension benefit
$
—

 
$
0.6

 
$
—

 
$
1.8