Condensed consolidating financial information - Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Feb. 01, 2020	Feb. 03, 2019	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017
Current assets:
Cash and cash equivalents	$ 374.5		$ 195.4
Accounts receivable	38.8		23.7
Intra-entity receivables, net	0.0		0.0
Other receivables			72.5
Other current assets	403.5		171.5
Income taxes	6.3		5.8
Inventories, net	2,331.7		2,386.9
Total current assets	3,154.8		2,855.8
Non-current assets:
Property, plant and equipment, net	741.9		800.5
Operating lease right-of-use assets	1,683.3	$ 1,927.2
Goodwill	248.8		296.6	$ 821.7
Intangible assets, net	263.8		265.0
Investment in subsidiaries	0.0
Intra-entity receivables, net	0.0
Other assets	201.8		150.6
Deferred tax assets	4.7		21.0
Retirement benefit asset			30.6
Total assets	6,299.1		4,420.1
Current liabilities:
Loans and overdrafts	95.6		78.8
Accounts payable	227.9		153.7
Intra-entity payables, net			0.0
Accrued expenses and other current liabilities	697.0	469.9	502.8
Deferred revenue	266.2		270.0
Operating lease liabilities	338.2	376.5
Income taxes	27.7		27.7
Total current liabilities	1,652.6		1,033.0
Non-current liabilities:
Long-term debt	515.9		649.6
Operating lease liabilities	1,437.7	1,676.9
Other liabilities	116.6	$ 122.0	224.1
Deferred revenue	731.5		696.5
Deferred tax liabilities	5.2		0.0
Total liabilities	4,459.5		2,603.2
Series A redeemable convertible preferred shares	617.0		615.3
Shareholders’ equity:
Total shareholders’ equity	1,222.6		1,201.6	$ 2,499.8	$ 2,490.2
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	6,299.1		4,420.1
Consolidation, Eliminations
Current assets:
Cash and cash equivalents	0.0		0.0
Accounts receivable	0.0		0.0
Intra-entity receivables, net	(632.6)		(311.3)
Other receivables			0.0
Other current assets	0.0		0.0
Income taxes	0.0		0.0
Inventories, net	0.0		0.0
Total current assets	(632.6)		(311.3)
Non-current assets:
Property, plant and equipment, net	0.0
Operating lease right-of-use assets	0.0
Goodwill	0.0
Intangible assets, net	0.0		0.0
Investment in subsidiaries	(3,335.0)		(1,834.5)
Intra-entity receivables, net	(1,409.0)		(2,988.0)
Other assets	0.0
Deferred tax assets	0.0
Total assets	(5,376.6)		(5,133.8)
Current liabilities:
Loans and overdrafts	0.0		0.0
Accounts payable	0.0		0.0
Intra-entity payables, net	(632.6)		(311.3)
Accrued expenses and other current liabilities	0.0		0.0
Deferred revenue	0.0		0.0
Operating lease liabilities	0.0
Income taxes	0.0		0.0
Total current liabilities	(632.6)		(311.3)
Non-current liabilities:
Operating lease liabilities	0.0
Intra-entity payables, net	(1,409.0)		(2,988.0)
Total liabilities	(2,041.6)		(3,299.3)
Series A redeemable convertible preferred shares	0.0		0.0
Shareholders’ equity:
Total shareholders’ equity	(3,335.0)		(1,834.5)
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	(5,376.6)		(5,133.8)
Parent | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.2		0.2
Accounts receivable	0.0		0.0
Other receivables			0.0
Other current assets			0.0
Income taxes	0.0		0.0
Inventories, net	0.0		0.0
Total current assets	0.2		0.2
Non-current assets:
Property, plant and equipment, net	0.0
Operating lease right-of-use assets	0.0
Goodwill	0.0
Intangible assets, net	0.0		0.0
Investment in subsidiaries	2,110.8		2,155.7
Intra-entity receivables, net	0.0
Other assets	0.0
Deferred tax assets	0.0
Total assets	2,111.0		2,155.9
Current liabilities:
Loans and overdrafts	0.0		0.0
Accounts payable	0.0		0.0
Intra-entity payables, net	243.4		311.3
Accrued expenses and other current liabilities	28.0		27.7
Deferred revenue	0.0		0.0
Operating lease liabilities	0.0
Income taxes	0.0		0.0
Total current liabilities	271.4		339.0
Non-current liabilities:
Operating lease liabilities	0.0
Total liabilities	271.4		339.0
Series A redeemable convertible preferred shares	617.0		615.3
Shareholders’ equity:
Total shareholders’ equity	1,222.6		1,201.6
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	2,111.0		2,155.9
Issuer | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.1		0.1
Accounts receivable	0.0		0.0
Intra-entity receivables, net	3.3		7.9
Other receivables			0.0
Other current assets			0.0
Income taxes	0.0		0.0
Inventories, net	0.0		0.0
Total current assets	3.4		8.0
Non-current assets:
Property, plant and equipment, net	0.0		0.0
Operating lease right-of-use assets	0.0
Goodwill	0.0		0.0
Intangible assets, net	0.0		0.0
Investment in subsidiaries	0.0		0.0
Intra-entity receivables, net	161.0		400.0
Other assets			0.0
Deferred tax assets	0.0		0.0
Retirement benefit asset			0.0
Total assets	164.4		408.0
Current liabilities:
Loans and overdrafts	0.0		(0.7)
Accounts payable	0.0		0.0
Intra-entity payables, net	0.0		0.0
Accrued expenses and other current liabilities	1.0		2.4
Deferred revenue	0.0		0.0
Operating lease liabilities	0.0
Income taxes	1.4		0.8
Total current liabilities	2.4		2.5
Non-current liabilities:
Long-term debt	146.4		396.0
Operating lease liabilities	0.0
Intra-entity payables, net			0.0
Other liabilities			0.0
Deferred revenue			0.0
Total liabilities	148.8		398.5
Series A redeemable convertible preferred shares	0.0		0.0
Shareholders’ equity:
Total shareholders’ equity	15.6		9.5
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	164.4		408.0
Guarantors | Reportable Legal Entities
Current assets:
Cash and cash equivalents	277.5		146.7
Accounts receivable	13.1		14.3
Intra-entity receivables, net	30.7		83.4
Other receivables			46.5
Other current assets	318.1		169.4
Income taxes	6.3		5.1
Inventories, net	2,232.8		2,302.6
Total current assets	2,878.5		2,768.0
Non-current assets:
Property, plant and equipment, net	733.1		789.6
Operating lease right-of-use assets	1,677.8
Goodwill	171.0		206.3
Intangible assets, net	243.6		244.0
Investment in subsidiaries	749.3		(15.7)
Intra-entity receivables, net	0.0
Other assets	179.4		133.4
Deferred tax assets	4.7		24.5
Retirement benefit asset			30.6
Total assets	6,637.4		4,180.7
Current liabilities:
Loans and overdrafts	95.6		79.5
Accounts payable	166.4		119.7
Intra-entity payables, net	389.2
Accrued expenses and other current liabilities	648.1		450.4
Deferred revenue	250.8		257.6
Operating lease liabilities	336.4
Income taxes	24.5		26.4
Total current liabilities	1,911.0		933.6
Non-current liabilities:
Long-term debt	369.5		253.6
Operating lease liabilities	1,431.8
Intra-entity payables, net	1,409.0		2,988.0
Other liabilities	113.6		219.4
Deferred revenue	731.5		696.5
Deferred tax liabilities	2.3
Total liabilities	5,968.7		5,091.1
Series A redeemable convertible preferred shares	0.0		0.0
Shareholders’ equity:
Total shareholders’ equity	668.7		(910.4)
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	6,637.4		4,180.7
Non-Guarantors | Reportable Legal Entities
Current assets:
Cash and cash equivalents	96.7		48.4
Accounts receivable	25.7		9.4
Intra-entity receivables, net	598.6		220.0
Other receivables			26.0
Other current assets	85.4		2.1
Income taxes	0.0		0.7
Inventories, net	98.9		84.3
Total current assets	905.3		390.9
Non-current assets:
Property, plant and equipment, net	8.8		10.9
Operating lease right-of-use assets	5.5
Goodwill	77.8		90.3
Intangible assets, net	20.2		21.0
Investment in subsidiaries	474.9		(305.5)
Intra-entity receivables, net	1,248.0		2,588.0
Other assets	22.4		17.2
Deferred tax assets			(3.5)
Total assets	2,762.9		2,809.3
Current liabilities:
Loans and overdrafts	0.0		0.0
Accounts payable	61.5		34.0
Intra-entity payables, net	0.0		0.0
Accrued expenses and other current liabilities	19.9		22.3
Deferred revenue	15.4		12.4
Operating lease liabilities	1.8
Income taxes	1.8		0.5
Total current liabilities	100.4		69.2
Non-current liabilities:
Operating lease liabilities	5.9
Other liabilities	3.0		4.7
Deferred tax liabilities	2.9
Total liabilities	112.2		73.9
Series A redeemable convertible preferred shares	0.0		0.0
Shareholders’ equity:
Total shareholders’ equity	2,650.7		2,735.4
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	$ 2,762.9		$ 2,809.3