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Condensed consolidating financial information - Condensed consolidating statement of comprehensive income (loss) (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Nov. 02, 2019	Aug. 03, 2019	May 04, 2019	Nov. 03, 2018	Aug. 04, 2018	May 05, 2018	Nov. 02, 2019	Nov. 03, 2018
Condensed Statement of Comprehensive Income [Line Items]
Net income		$ (35.5)	$ (36.1)	$ (10.0)	$ (29.9)	$ (23.0)	$ (496.6)	$ (81.6)	$ (549.5)
Other comprehensive income (loss):
Foreign currency translation adjustments		19.9			(2.5)			(6.1)	(39.5)
Available-for-sale securities:
Unrealized gain (loss)		(0.4)			0.0			(0.2)	0.3
Reclassification adjustment for (gains) losses to net income		1.0			0.0			1.0	0.0
Impact from adoption of new accounting pronouncements	[1]							0.0	(0.8)
Cash flow hedges:
Unrealized gain (loss)		2.4						8.6
Unrealized gain (loss)					2.3				0.8
Reclassification adjustment for (gains) losses to net income		(0.4)						(0.8)
Reclassification adjustment for (gains) losses to net income					(0.5)				(1.0)
Pension plan:
Actuarial loss								0.0	(6.5)
Reclassification adjustment to net income for amortization of actuarial loss		0.3			0.2			0.8	0.5
Total other comprehensive income (loss)		22.8			(0.5)			3.3	(46.2)
Total comprehensive income (loss)		(12.7)			(30.4)			(78.3)	(595.7)
Consolidation, Eliminations
Condensed Statement of Comprehensive Income [Line Items]
Net income		216.2			189.9			579.5	2,268.3
Other comprehensive income (loss):
Foreign currency translation adjustments		(19.9)			2.5			6.1	39.5
Available-for-sale securities:
Unrealized gain (loss)		0.4						0.2	(0.3)
Reclassification adjustment for (gains) losses to net income		(1.0)						(1.0)
Impact from adoption of new accounting pronouncements									0.8
Cash flow hedges:
Unrealized gain (loss)		(2.4)						(8.6)
Unrealized gain (loss)					(2.3)				(0.8)
Reclassification adjustment for (gains) losses to net income		0.4						0.8
Reclassification adjustment for (gains) losses to net income					0.5				1.0
Pension plan:
Actuarial loss									6.5
Reclassification adjustment to net income for amortization of actuarial loss		(0.3)			(0.2)			(0.8)	(0.5)
Total other comprehensive income (loss)		(22.8)			0.5			(3.3)	46.2
Total comprehensive income (loss)		193.4			190.4			576.2	2,314.5
Signet Jewelers Limited | Reportable Legal Entities
Condensed Statement of Comprehensive Income [Line Items]
Net income		(35.5)			(29.9)			(81.6)	(549.5)
Other comprehensive income (loss):
Foreign currency translation adjustments		19.9			(2.5)			(6.1)	(39.5)
Available-for-sale securities:
Unrealized gain (loss)		(0.4)						(0.2)	0.3
Reclassification adjustment for (gains) losses to net income		1.0						1.0
Impact from adoption of new accounting pronouncements									(0.8)
Cash flow hedges:
Unrealized gain (loss)		2.4						8.6
Unrealized gain (loss)					2.3				0.8
Reclassification adjustment for (gains) losses to net income		(0.4)						(0.8)
Reclassification adjustment for (gains) losses to net income					(0.5)				(1.0)
Pension plan:
Actuarial loss									(6.5)
Reclassification adjustment to net income for amortization of actuarial loss		0.3			0.2			0.8	0.5
Total other comprehensive income (loss)		22.8			(0.5)			3.3	(46.2)
Total comprehensive income (loss)		(12.7)			(30.4)			(78.3)	(595.7)
Signet UK Finance plc | Reportable Legal Entities
Condensed Statement of Comprehensive Income [Line Items]
Net income		7.0			(0.3)			6.6	(0.6)
Other comprehensive income (loss):
Foreign currency translation adjustments		0.0						0.0	0.0
Available-for-sale securities:
Unrealized gain (loss)		0.0						0.0	0.0
Reclassification adjustment for (gains) losses to net income		0.0						0.0
Impact from adoption of new accounting pronouncements									0.0
Cash flow hedges:
Unrealized gain (loss)		0.0						0.0
Unrealized gain (loss)					0.0				0.0
Reclassification adjustment for (gains) losses to net income		0.0						0.0
Reclassification adjustment for (gains) losses to net income					0.0				0.0
Pension plan:
Actuarial loss									0.0
Reclassification adjustment to net income for amortization of actuarial loss		0.0			0.0			0.0	0.0
Total other comprehensive income (loss)		0.0			0.0			0.0	0.0
Total comprehensive income (loss)		7.0			(0.3)			6.6	(0.6)
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Statement of Comprehensive Income [Line Items]
Net income		(195.7)			(164.9)			(524.4)	(1,674.4)
Other comprehensive income (loss):
Foreign currency translation adjustments		20.1			(2.5)			(6.0)	(39.0)
Available-for-sale securities:
Unrealized gain (loss)		0.0						0.0	0.0
Reclassification adjustment for (gains) losses to net income		0.0
Impact from adoption of new accounting pronouncements									0.0
Cash flow hedges:
Unrealized gain (loss)		2.4						8.6
Unrealized gain (loss)					2.3				0.8
Reclassification adjustment for (gains) losses to net income		(0.4)						(0.8)
Reclassification adjustment for (gains) losses to net income					(0.5)				(1.0)
Pension plan:
Actuarial loss									(6.5)
Reclassification adjustment to net income for amortization of actuarial loss		0.3			0.2			0.8	0.5
Total other comprehensive income (loss)		22.4			(0.5)			2.6	(45.2)
Total comprehensive income (loss)		(173.3)			(165.4)			(521.8)	(1,719.6)
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Statement of Comprehensive Income [Line Items]
Net income		(27.5)			(24.7)			(61.7)	(593.3)
Other comprehensive income (loss):
Foreign currency translation adjustments		(0.2)						(0.1)	(0.5)
Available-for-sale securities:
Unrealized gain (loss)		(0.4)						(0.2)	0.3
Reclassification adjustment for (gains) losses to net income		1.0						1.0
Impact from adoption of new accounting pronouncements									(0.8)
Cash flow hedges:
Unrealized gain (loss)		0.0						0.0
Unrealized gain (loss)					0.0				0.0
Reclassification adjustment for (gains) losses to net income		0.0						0.0
Reclassification adjustment for (gains) losses to net income					0.0				0.0
Pension plan:
Actuarial loss									0.0
Reclassification adjustment to net income for amortization of actuarial loss		0.0			0.0			0.0	0.0
Total other comprehensive income (loss)		0.4			0.0			0.7	(1.0)
Total comprehensive income (loss)		$ (27.1)			$ (24.7)			$ (61.0)	$ (594.3)
[1] Adjustment reflects the reclassification of unrealized gains related to the Company’s available-for-sale equity securities as of February 3, 2018 from AOCI into retained earnings associated with the adoption of ASU 2016-01.

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