Condensed Consolidating Financial Information - Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Current assets:
Cash and cash equivalents	$ 98.7	$ 137.7	$ 193.6	$ 247.6
Accounts receivable, net	1,858.0	1,756.4
Intra-entity receivables, net	0.0	0.0
Other receivables	95.9	84.0
Other current assets	136.3	152.6
Income taxes	4.4	3.5
Inventories	2,449.3	2,453.9
Total current assets	4,642.6	4,588.1
Non-current assets:
Property, plant and equipment, net	822.9	727.6
Goodwill	517.6	515.5	519.2
Intangible assets, net	417.0	427.8
Investment in subsidiaries	0.0
Intra-entity receivables, net	0.0
Other assets	165.1	154.6
Deferred tax assets	0.7	0.0
Retirement benefit asset	31.9	51.3
Total assets	6,597.8	6,464.9
Current liabilities:
Loans and overdrafts	91.1	57.7
Accounts payable	255.7	269.1
Intra-entity payables, net		0.0
Accrued expenses and other current liabilities	478.2	498.3
Deferred revenue	276.9	260.3
Income taxes	101.8	65.7
Total current liabilities	1,203.7	1,151.1
Non-current liabilities:
Long-term debt	1,317.9	1,321.0
Other liabilities	213.7	230.5
Deferred revenue	659.0	629.1
Deferred tax liabilities	101.4	72.5
Total liabilities	3,495.7	3,404.2
Shareholders’ equity:
Total shareholders’ equity	2,490.2	3,060.7	2,810.4	2,563.1
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	6,597.8	6,464.9
Consolidation, Eliminations
Current assets:
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts receivable, net	0.0	0.0
Intra-entity receivables, net	(157.8)	(408.8)
Other receivables	0.0	0.0
Other current assets	0.0	0.0
Income taxes	0.0	0.0
Inventories	0.0	0.0
Total current assets	(157.8)	(408.8)
Non-current assets:
Property, plant and equipment, net	0.0
Goodwill	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	(4,430.1)	(4,410.7)
Intra-entity receivables, net	(4,050.0)	(3,870.0)
Other assets	0.0
Deferred tax assets	0.0
Retirement benefit asset	0.0
Total assets	(8,637.9)	(8,689.5)
Current liabilities:
Loans and overdrafts	0.0	0.0
Accounts payable	0.0	0.0
Intra-entity payables, net	(157.8)	(408.8)
Accrued expenses and other current liabilities	0.0	0.0
Deferred revenue	0.0	0.0
Income taxes	0.0	0.0
Total current liabilities	(157.8)	(408.8)
Non-current liabilities:
Intra-entity payables, net	(4,050.0)	(3,870.0)
Total liabilities	(4,207.8)	(4,278.8)
Shareholders’ equity:
Total shareholders’ equity	(4,430.1)	(4,410.7)
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	(8,637.9)	(8,689.5)
Signet Jewelers Limited | Reportable Legal Entities
Current assets:
Cash and cash equivalents	1.7	1.9	2.1	1.4
Accounts receivable, net	0.0	0.0
Intra-entity receivables, net	12.7	28.7
Other receivables	0.0	0.0
Other current assets		0.1
Income taxes	0.0	0.0
Inventories	0.0	0.0
Total current assets	14.4	30.7
Non-current assets:
Property, plant and equipment, net	0.0
Goodwill	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	3,117.6	3,047.8
Intra-entity receivables, net	0.0
Other assets	0.0
Deferred tax assets	0.0
Retirement benefit asset	0.0
Total assets	3,132.0	3,078.5
Current liabilities:
Loans and overdrafts	0.0	0.0
Accounts payable	0.0	0.0
Intra-entity payables, net	0.0	0.0
Accrued expenses and other current liabilities	29.9	17.8
Deferred revenue	0.0	0.0
Income taxes	0.0	0.0
Total current liabilities	29.9	17.8
Non-current liabilities:
Total liabilities	29.9	17.8
Shareholders’ equity:
Total shareholders’ equity	2,490.2	3,060.7
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	3,132.0	3,078.5
Signet UK Finance plc | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.1	0.1	0.1	0.0
Accounts receivable, net	0.0	0.0
Intra-entity receivables, net	0.0	0.0
Other receivables	0.0	0.0
Other current assets		0.0
Income taxes	0.0	0.2
Inventories	0.0	0.0
Total current assets	0.1	0.3
Non-current assets:
Property, plant and equipment, net	0.0	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	402.9	402.6
Other assets		0.0
Deferred tax assets	0.0	0.0
Retirement benefit asset	0.0	0.0
Total assets	403.0	402.9
Current liabilities:
Loans and overdrafts	(0.7)	(0.7)
Accounts payable	0.0	0.0
Intra-entity payables, net	0.0	0.0
Accrued expenses and other current liabilities	2.5	2.4
Deferred revenue	0.0	0.0
Income taxes	(0.2)	0.0
Total current liabilities	1.6	1.7
Non-current liabilities:
Long-term debt	394.3	393.5
Intra-entity payables, net		0.0
Other liabilities		0.0
Deferred revenue		0.0
Total liabilities	395.9	395.2
Shareholders’ equity:
Total shareholders’ equity	7.1	7.7
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	403.0	402.9
Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	70.3	102.0	166.5	237.0
Accounts receivable, net	1,858.0	1,753.0
Intra-entity receivables, net	145.1	0.0
Other receivables	71.1	68.8
Other current assets	131.4	144.2
Income taxes	4.4	2.3
Inventories	2,371.8	2,372.7
Total current assets	4,652.1	4,443.0
Non-current assets:
Property, plant and equipment, net	818.5	722.3
Goodwill	514.0	511.9
Intangible assets, net	417.0	427.8
Investment in subsidiaries	721.6	762.9
Intra-entity receivables, net	0.0
Other assets	134.8	124.5
Deferred tax assets	0.6
Retirement benefit asset	31.9	51.3
Total assets	7,290.5	7,043.7
Current liabilities:
Loans and overdrafts	91.8	58.4
Accounts payable	248.2	260.3
Intra-entity payables, net		408.8
Accrued expenses and other current liabilities	429.2	467.0
Deferred revenue	275.5	260.3
Income taxes	115.5	68.4
Total current liabilities	1,160.2	1,523.2
Non-current liabilities:
Long-term debt	323.6	327.5
Intra-entity payables, net	4,050.0	3,870.0
Other liabilities	208.7	223.6
Deferred revenue	659.0	629.1
Deferred tax liabilities	101.4	73.0
Total liabilities	6,502.9	6,646.4
Shareholders’ equity:
Total shareholders’ equity	787.6	397.3
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	7,290.5	7,043.7
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	26.6	33.7	$ 24.9	$ 9.2
Accounts receivable, net		3.4
Intra-entity receivables, net		380.1
Other receivables	24.8	15.2
Other current assets	4.9	8.3
Income taxes	0.0	1.0
Inventories	77.5	81.2
Total current assets	133.8	522.9
Non-current assets:
Property, plant and equipment, net	4.4	5.3
Goodwill	3.6	3.6
Intangible assets, net	0.0	0.0
Investment in subsidiaries	590.9	600.0
Intra-entity receivables, net	3,647.1	3,467.4
Other assets	30.3	30.1
Deferred tax assets	0.1
Retirement benefit asset	0.0
Total assets	4,410.2	4,629.3
Current liabilities:
Loans and overdrafts	0.0	0.0
Accounts payable	7.5	8.8
Intra-entity payables, net	157.8	0.0
Accrued expenses and other current liabilities	16.6	11.1
Deferred revenue	1.4	0.0
Income taxes	(13.5)	(2.7)
Total current liabilities	169.8	17.2
Non-current liabilities:
Long-term debt	600.0	600.0
Other liabilities	5.0	6.9
Deferred tax liabilities		(0.5)
Total liabilities	774.8	623.6
Shareholders’ equity:
Total shareholders’ equity	3,635.4	4,005.7
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	4,410.2	4,629.3
Series A Redeemable Convertible Preferred Stock
Non-current liabilities:
Series A redeemable convertible preferred shares	611.9	0.0
Series A Redeemable Convertible Preferred Stock | Consolidation, Eliminations
Non-current liabilities:
Series A redeemable convertible preferred shares	0.0
Series A Redeemable Convertible Preferred Stock | Signet Jewelers Limited | Reportable Legal Entities
Non-current liabilities:
Series A redeemable convertible preferred shares	611.9	0.0
Series A Redeemable Convertible Preferred Stock | Signet UK Finance plc | Reportable Legal Entities
Non-current liabilities:
Series A redeemable convertible preferred shares	0.0	0.0
Series A Redeemable Convertible Preferred Stock | Guarantor Subsidiaries | Reportable Legal Entities
Non-current liabilities:
Series A redeemable convertible preferred shares	0.0	0.0
Series A Redeemable Convertible Preferred Stock | Non-Guarantor Subsidiaries | Reportable Legal Entities
Non-current liabilities:
Series A redeemable convertible preferred shares	$ 0.0	$ 0.0