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Income taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Jan. 30, 2021
Feb. 01, 2020
Assets    
Foreign property, plant and equipment $ 7.3 $ 6.5
Revenue deferral 95.6 102.5
Derivative instruments 0.3  
Lease liabilities 331.5 380.6
Deferred compensation 6.7 7.3
Share-based compensation 4.4 4.1
Other temporary differences 57.2 77.7
Net operating losses and foreign tax credits 56.5 137.0
Value of capital losses 13.9 12.9
Total gross deferred tax assets (liabilities) 573.4 728.6
Valuation allowance (83.9) (38.4)
Deferred tax assets (liabilities) 489.5 690.2
(Liabilities)    
Intangible assets (41.7) (63.0)
US property, plant and equipment (55.3) (55.4)
Inventory valuation (230.4) (203.1)
Derivative instruments   (4.3)
Lease assets (295.1) (358.2)
Retirement benefit obligations (9.8) (6.7)
Total gross deferred tax assets (liabilities) (632.3) (690.7)
Total    
Total gross deferred tax assets (liabilities) (58.9) 37.9
Valuation allowance (83.9) (38.4)
Deferred tax liabilities, net (142.8) (0.5)
Deferred tax assets 16.4 4.7
Non-current liabilities $ (159.2) $ (5.2)