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Condensed consolidating financial information - Condensed consolidating balance sheet (Details) - USD ($) $ in Millions	Nov. 02, 2019	Aug. 03, 2019	May 04, 2019	Feb. 03, 2019	Feb. 02, 2019	Nov. 03, 2018	Aug. 04, 2018	May 05, 2018	Feb. 03, 2018
Current assets:
Cash and cash equivalents	$ 188.6				$ 195.4	$ 130.7
Accounts receivable	20.8				23.7	14.1
Intra-entity receivables, net	0.0				0.0	0.0
Other current assets	207.2			$ 235.2	244.0	218.2
Income taxes	2.7				5.8	0.0
Inventories	2,519.4				2,386.9	2,647.1
Total current assets	2,938.7				2,855.8	3,010.1
Non-current assets:
Property, plant and equipment, net	751.2				800.5	810.4
Operating lease right-of-use assets	1,684.0			1,927.2	0.0
Goodwill	248.8				296.6	509.0			$ 821.7
Intangible assets, net	264.2				265.0	340.2
Investment in subsidiaries	0.0					0.0
Intra-entity receivables, net	0.0					0.0
Other assets	196.4				181.2	201.6
Deferred tax assets	18.3				21.0	36.2
Total assets	6,101.6				4,420.1	4,907.5
Current liabilities:
Loans and overdrafts	5.0				78.8	322.6
Accounts payable	333.9				153.7	339.6
Intra-entity payables, net					0.0	0.0
Accrued expenses and other current liabilities	434.6			469.9	502.8	431.3
Deferred revenue	267.3				270.0	253.1
Operating lease liabilities	324.9			376.5	0.0
Income taxes	17.4				27.7	19.1
Total current liabilities	1,383.1				1,033.0	1,365.7
Non-current liabilities:
Long-term debt	788.8				649.6	660.4
Operating lease liabilities	1,448.9			1,676.9	0.0
Other liabilities	120.4			$ 122.0	224.1	233.2
Deferred revenue	693.2				696.5	671.7
Deferred tax liabilities	0.0				0.0	12.7
Total liabilities	4,434.4				2,603.2	2,943.7
Series A redeemable convertible preferred shares	616.5				615.3	614.8
Shareholders’ equity:
Total shareholders’ equity	1,050.7	$ 1,088.2	$ 1,161.4		1,201.6	1,349.0	$ 1,400.1	$ 1,892.6	$ 2,499.8
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	6,101.6				4,420.1	4,907.5
Consolidation, Eliminations
Current assets:
Cash and cash equivalents	0.0				0.0	0.0
Accounts receivable	0.0				0.0	0.0
Intra-entity receivables, net	(371.0)				(311.3)	(243.5)
Other current assets	0.0				0.0	0.0
Income taxes	0.0				0.0
Inventories	0.0				0.0	0.0
Total current assets	(371.0)				(311.3)	(243.5)
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	0.0
Investment in subsidiaries	(1,071.0)				(1,834.5)	(2,071.2)
Intra-entity receivables, net	(2,734.0)				(2,988.0)	(2,993.0)
Other assets	0.0				0.0	0.0
Deferred tax assets	0.0					0.0
Total assets	(4,176.0)				(5,133.8)	(5,307.7)
Current liabilities:
Loans and overdrafts	0.0				0.0	0.0
Accounts payable	0.0				0.0	0.0
Intra-entity payables, net	(371.0)				(311.3)	(243.5)
Accrued expenses and other current liabilities	0.0				0.0	0.0
Deferred revenue	0.0				0.0	0.0
Operating lease liabilities	0.0
Income taxes	0.0				0.0	0.0
Total current liabilities	(371.0)				(311.3)	(243.5)
Non-current liabilities:
Long-term debt						0.0
Intra-entity payables, net	(2,734.0)				(2,988.0)	(2,993.0)
Operating lease liabilities	0.0
Other liabilities						0.0
Deferred revenue						0.0
Deferred tax liabilities						0.0
Total liabilities	(3,105.0)				(3,299.3)	(3,236.5)
Series A redeemable convertible preferred shares	0.0				0.0	0.0
Shareholders’ equity:
Total shareholders’ equity	(1,071.0)				(1,834.5)	(2,071.2)
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	(4,176.0)				(5,133.8)	(5,307.7)
Signet Jewelers Limited | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.7				0.2	0.5
Accounts receivable	0.0				0.0	0.0
Intra-entity receivables, net						0.0
Other current assets	0.0				0.0	0.0
Income taxes	0.0				0.0
Inventories	0.0				0.0	0.0
Total current assets	0.7				0.2	0.5
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	0.0
Investment in subsidiaries	1,993.2				2,155.7	2,085.2
Intra-entity receivables, net	0.0					0.0
Other assets	0.0				0.0	0.0
Deferred tax assets	0.0					0.0
Total assets	1,993.9				2,155.9	2,085.7
Current liabilities:
Loans and overdrafts	0.0				0.0	0.0
Accounts payable	0.0				0.0	0.0
Intra-entity payables, net	298.3				311.3	94.4
Accrued expenses and other current liabilities	28.4				27.7	27.5
Deferred revenue	0.0				0.0	0.0
Operating lease liabilities	0.0
Income taxes	0.0				0.0	0.0
Total current liabilities	326.7				339.0	121.9
Non-current liabilities:
Long-term debt						0.0
Operating lease liabilities	0.0
Other liabilities						0.0
Deferred revenue						0.0
Deferred tax liabilities						0.0
Total liabilities	326.7				339.0	121.9
Series A redeemable convertible preferred shares	616.5				615.3	614.8
Shareholders’ equity:
Total shareholders’ equity	1,050.7				1,201.6	1,349.0
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	1,993.9				2,155.9	2,085.7
Signet UK Finance plc | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.1				0.1	0.1
Accounts receivable	0.0				0.0	0.0
Intra-entity receivables, net	5.6				7.9	7.7
Other current assets	0.0				0.0	0.0
Income taxes	0.0				0.0
Inventories	0.0				0.0	0.0
Total current assets	5.7				8.0	7.8
Non-current assets:
Property, plant and equipment, net	0.0				0.0	0.0
Operating lease right-of-use assets	0.0
Goodwill	0.0				0.0	0.0
Intangible assets, net	0.0				0.0	0.0
Investment in subsidiaries	0.0				0.0	0.0
Intra-entity receivables, net	161.0				400.0	400.0
Other assets	0.0				0.0	0.0
Deferred tax assets	0.0				0.0	0.0
Total assets	166.7				408.0	407.8
Current liabilities:
Loans and overdrafts	0.0				(0.7)	(0.7)
Accounts payable	0.0				0.0	0.0
Intra-entity payables, net	0.0				0.0	0.0
Accrued expenses and other current liabilities	2.6				2.4	7.1
Deferred revenue	0.0				0.0	0.0
Operating lease liabilities	0.0
Income taxes					0.8	0.0
Total current liabilities	2.6				2.5	6.4
Non-current liabilities:
Long-term debt	146.3				396.0	395.8
Intra-entity payables, net					0.0	0.0
Operating lease liabilities	0.0
Other liabilities					0.0	0.0
Deferred revenue					0.0	0.0
Deferred tax liabilities						0.0
Total liabilities	148.9				398.5	402.2
Series A redeemable convertible preferred shares	0.0				0.0	0.0
Shareholders’ equity:
Total shareholders’ equity	17.8				9.5	5.6
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	166.7				408.0	407.8
Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	135.0				146.7	67.5
Accounts receivable	4.6				14.3	11.7
Intra-entity receivables, net	30.7				83.4	0.0
Other current assets	145.5				215.9	191.5
Income taxes	2.7				5.1
Inventories	2,427.5				2,302.6	2,568.6
Total current assets	2,746.0				2,768.0	2,839.3
Non-current assets:
Property, plant and equipment, net	741.6				789.6	801.7
Operating lease right-of-use assets	1,676.0
Goodwill	171.1				206.3	206.3
Intangible assets, net	243.9				244.0	266.4
Investment in subsidiaries	(331.2)				(15.7)	250.3
Intra-entity receivables, net	0.0					0.0
Other assets	173.8				164.0	183.9
Deferred tax assets	21.8				24.5	52.5
Total assets	5,443.0				4,180.7	4,600.4
Current liabilities:
Loans and overdrafts	5.0				79.5	323.3
Accounts payable	259.8				119.7	310.5
Intra-entity payables, net	72.7					149.1
Accrued expenses and other current liabilities	377.9				450.4	380.1
Deferred revenue	255.4				257.6	243.3
Operating lease liabilities	323.1
Income taxes					26.4	0.0
Total current liabilities	1,293.9				933.6	1,406.3
Non-current liabilities:
Long-term debt	642.5				253.6	264.6
Intra-entity payables, net	2,734.0				2,988.0	2,993.0
Operating lease liabilities	1,442.5
Other liabilities	116.6				219.4	228.0
Deferred revenue	693.2				696.5	671.7
Deferred tax liabilities						12.6
Total liabilities	6,922.7				5,091.1	5,576.2
Series A redeemable convertible preferred shares	0.0				0.0	0.0
Shareholders’ equity:
Total shareholders’ equity	(1,479.7)				(910.4)	(975.8)
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	5,443.0				4,180.7	4,600.4
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	52.8				48.4	62.6
Accounts receivable	16.2				9.4	2.4
Intra-entity receivables, net	334.7				220.0	235.8
Other current assets	61.7				28.1	26.7
Income taxes	0.0				0.7
Inventories	91.9				84.3	78.5
Total current assets	557.3				390.9	406.0
Non-current assets:
Property, plant and equipment, net	9.6				10.9	8.7
Operating lease right-of-use assets	8.0
Goodwill	77.7				90.3	302.7
Intangible assets, net	20.3				21.0	73.8
Investment in subsidiaries	(591.0)				(305.5)	(264.3)
Intra-entity receivables, net	2,573.0				2,588.0	2,593.0
Other assets	22.6				17.2	17.7
Deferred tax assets	(3.5)				(3.5)	(16.3)
Total assets	2,674.0				2,809.3	3,121.3
Current liabilities:
Loans and overdrafts	0.0				0.0	0.0
Accounts payable	74.1				34.0	29.1
Intra-entity payables, net	0.0				0.0	0.0
Accrued expenses and other current liabilities	25.7				22.3	16.6
Deferred revenue	11.9				12.4	9.8
Operating lease liabilities	1.8
Income taxes	17.4				0.5	19.1
Total current liabilities	130.9				69.2	74.6
Non-current liabilities:
Long-term debt						0.0
Operating lease liabilities	6.4
Other liabilities	3.8				4.7	5.2
Deferred revenue						0.0
Deferred tax liabilities						0.1
Total liabilities	141.1				73.9	79.9
Series A redeemable convertible preferred shares	0.0				0.0	0.0
Shareholders’ equity:
Total shareholders’ equity	2,532.9				2,735.4	3,041.4
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	$ 2,674.0				$ 2,809.3	$ 3,121.3

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