Condensed Consolidating Financial Information - Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Current assets:
Cash and cash equivalents	$ 137.7	$ 193.6	$ 247.6	$ 301.0
Accounts receivable, net	1,756.4	1,567.6
Intra-entity receivables, net	0.0	0.0
Other receivables	84.0	63.6
Other current assets	154.4	137.2
Income taxes	3.5	1.8
Inventories	2,453.9	2,439.0
Total current assets	4,589.9	4,402.8
Non-current assets:
Property, plant and equipment, net	727.6	665.9
Goodwill	515.5	519.2	26.8
Intangible assets, net	427.8	447.1
Investment in subsidiaries	0.0
Intra-entity receivables, net	0.0
Other assets	162.3	140.0
Deferred tax assets	0.0	2.3
Retirement benefit asset	51.3	37.0
Total assets	6,474.4	6,214.3
Debt, Current	59.5	97.5
Current liabilities:
Accounts payable	269.1	277.7
Intra-entity payables, net		0.0
Accrued expenses and other current liabilities	498.3	482.4
Deferred revenue	260.3	248.0
Income taxes	65.7	86.9
Total current liabilities	1,152.9	1,192.5
Non-current liabilities:
Long-term debt	1,328.7	1,363.8
Other liabilities	230.5	230.2
Deferred revenue	629.1	563.9
Deferred tax liabilities	72.5	53.5
Total liabilities	3,413.7	3,403.9
Shareholders’ equity:
Total shareholders’ equity	3,060.7	2,810.4	2,563.1	2,329.9
Total liabilities and shareholders’ equity	6,474.4	6,214.3
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	(408.8)	(183.4)
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	(408.8)	(183.4)
Non-current assets:
Property, plant and equipment, net	0.0
Goodwill	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	(4,410.7)	(3,585.8)
Intra-entity receivables, net	(3,870.0)	(3,892.4)
Other assets	0.0
Deferred tax assets	0.0
Retirement benefit asset	0.0
Total assets	(8,689.5)	(7,661.6)
Debt, Current	0.0	0.0
Current liabilities:
Accounts payable	0.0	0.0
Intra-entity payables, net	(408.8)	(183.4)
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	(408.8)	(183.4)
Non-current liabilities:
Intra-entity payables, net	(3,870.0)	(3,892.4)
Total liabilities	(4,278.8)	(4,075.8)
Shareholders’ equity:
Total shareholders’ equity	(4,410.7)	(3,585.8)
Total liabilities and shareholders’ equity	(8,689.5)	(7,661.6)
Signet Jewelers Limited | Reportable Legal Entities
Current assets:
Cash and cash equivalents	1.9	2.1	1.4	13.4
Accounts receivable, net	0.0	0.0
Intra-entity receivables, net	28.7	121.6
Other receivables	0.0	0.0
Other current assets	0.1	0.1
Income taxes	0.0	0.0
Inventories	0.0	0.0
Total current assets	30.7	123.8
Non-current assets:
Property, plant and equipment, net	0.0
Goodwill	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	3,047.8	2,701.3
Intra-entity receivables, net	0.0
Other assets	0.0
Deferred tax assets	0.0
Retirement benefit asset	0.0
Total assets	3,078.5	2,825.1
Debt, Current	0.0	0.0
Current liabilities:
Accounts payable	0.0	0.0
Intra-entity payables, net	0.0	0.0
Accrued expenses and other current liabilities	17.8	14.7
Deferred revenue	0.0	0.0
Income taxes	0.0	0.0
Total current liabilities	17.8	14.7
Non-current liabilities:
Total liabilities	17.8	14.7
Shareholders’ equity:
Total shareholders’ equity	3,060.7	2,810.4
Total liabilities and shareholders’ equity	3,078.5	2,825.1
Signet UK Finance plc | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.1	0.1	0.0	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	0.7	0.7
Income taxes	0.2	0.0
Inventories	0.0	0.0
Total current assets	1.0	0.8
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	402.6	402.4
Other assets	5.1	5.8
Deferred tax assets	0.0	0.0
Retirement benefit asset	0.0	0.0
Total assets	408.7	409.0
Debt, Current	0.0	0.0
Current liabilities:
Accounts payable	0.0	0.0
Intra-entity payables, net	0.0	0.0
Accrued expenses and other current liabilities	2.4	2.4
Deferred revenue	0.0	0.0
Income taxes		(0.2)
Total current liabilities	2.4	2.2
Non-current liabilities:
Long-term debt	398.6	398.5
Intra-entity payables, net		0.0
Other liabilities		0.0
Deferred revenue		0.0
Total liabilities	401.0	400.7
Shareholders’ equity:
Total shareholders’ equity	7.7	8.3
Total liabilities and shareholders’ equity	408.7	409.0
Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	102.0	166.5	237.0	271.3
Accounts receivable, net	1,753.0	1,566.2
Intra-entity receivables, net	0.0	0.0
Other receivables	68.8	53.9
Other current assets	145.3	130.9
Income taxes	2.3	1.8
Inventories	2,372.7	2,376.6
Total current assets	4,444.1	4,295.9
Non-current assets:
Property, plant and equipment, net	722.3	660.2
Goodwill	511.9	515.6
Intangible assets, net	427.8	447.1
Investment in subsidiaries	762.9	462.8
Intra-entity receivables, net	0.0
Other assets	127.1	105.3
Deferred tax assets		2.0
Retirement benefit asset	51.3	37.0
Total assets	7,047.4	6,525.9
Debt, Current	59.5	97.5
Current liabilities:
Accounts payable	260.3	273.4
Intra-entity payables, net	408.8	183.4
Accrued expenses and other current liabilities	467.0	456.7
Deferred revenue	260.3	248.0
Income taxes	68.4	87.7
Total current liabilities	1,524.3	1,346.7
Non-current liabilities:
Long-term debt	330.1	365.3
Intra-entity payables, net	3,870.0	3,892.4
Other liabilities	223.6	222.0
Deferred revenue	629.1	563.9
Deferred tax liabilities	73.0	53.5
Total liabilities	6,650.1	6,443.8
Shareholders’ equity:
Total shareholders’ equity	397.3	82.1
Total liabilities and shareholders’ equity	7,047.4	6,525.9
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	33.7	24.9	$ 9.2	$ 16.3
Accounts receivable, net	3.4	1.4
Intra-entity receivables, net	380.1	61.8
Other receivables	15.2	9.7
Other current assets	8.3	5.5
Income taxes	1.0
Inventories	81.2	62.4
Total current assets	522.9	165.7
Non-current assets:
Property, plant and equipment, net	5.3	5.7
Goodwill	3.6	3.6
Intangible assets, net	0.0	0.0
Investment in subsidiaries	600.0	421.7
Intra-entity receivables, net	3,467.4	3,490.0
Other assets	30.1	28.9
Deferred tax assets		0.3
Retirement benefit asset	0.0
Total assets	4,629.3	4,115.9
Debt, Current	0.0	0.0
Current liabilities:
Accounts payable	8.8	4.3
Intra-entity payables, net	0.0	0.0
Accrued expenses and other current liabilities	11.1	8.6
Deferred revenue	0.0	0.0
Income taxes	(2.7)	(0.6)
Total current liabilities	17.2	12.3
Non-current liabilities:
Long-term debt	600.0	600.0
Other liabilities	6.9	8.2
Deferred tax liabilities	(0.5)
Total liabilities	623.6	620.5
Shareholders’ equity:
Total shareholders’ equity	4,005.7	3,495.4
Total liabilities and shareholders’ equity	$ 4,629.3	$ 4,115.9