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Pension plans (Tables)
 6 Months Ended
Jul. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic pension benefit for the UK Plan are as follows:
 
13 weeks ended
 
26 weeks ended
(in millions)
July 30, 2016
 
August 1, 2015
 
July 30, 2016
 
August 1, 2015
Components of net periodic pension benefit (cost):
 
 
 
 
 
 
 
Service cost
$
(0.5
)
 
$
(0.7
)
 
$
(1.0
)
 
$
(1.3
)
Interest cost
(1.9
)
 
(2.0
)
 
(3.8
)
 
(3.9
)
Expected return on UK Plan assets
2.8

 
3.0

 
5.5

 
5.8

Amortization of unrecognized actuarial losses
(0.4
)
 
(0.9
)
 
(0.8
)
 
(1.7
)
Amortization of unrecognized net prior service credits
0.5

 
0.6

 
1.0

 
1.1

Net periodic pension benefit
$
0.5

 
$
—

 
$
0.9

 
$
—