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Pension plans (Tables)
 3 Months Ended
May 02, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic pension cost and other amounts recognized in OCI for the UK Plan are as follows:
 
13 weeks ended
(in millions)
May 2, 2015
 
May 3, 2014
Components of net periodic pension benefit (cost):
 
 
 
Service cost
$
(0.6
)
 
$
(0.6
)
Interest cost
(1.9
)
 
(2.5
)
Expected return on UK Plan assets
2.8

 
3.8

Amortization of unrecognized net prior service credit
0.5

 
0.4

Amortization of unrecognized actuarial loss
(0.8
)
 
(0.5
)
Net periodic pension benefit
$
—

 
$
0.6