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Condensed consolidating financial information - Condensed consolidated statement of operations (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Aug. 03, 2019	May 04, 2019	Aug. 04, 2018	May 05, 2018	Aug. 03, 2019	Aug. 04, 2018
Condensed Income Statements, Captions [Line Items]
Sales	$ 1,364.4		$ 1,420.1		$ 2,796.1	$ 2,900.7
Cost of sales	(901.3)		(929.9)		(1,833.6)	(1,925.7)
Gross margin	458.7		427.0		958.1	911.8
Selling, general and administrative expenses	(411.4)		(444.8)		(886.6)	(927.6)
Credit transaction, net	0.0		(23.9)		0.0	(167.0)
Restructuring charges	(23.4)		(19.6)		(50.2)	(26.1)
Goodwill and intangible impairments	(47.7)		0.0		(47.7)	(448.7)
Other operating income, net	1.4		3.2		1.4	25.3
Operating income (loss)	(22.4)		(58.1)		(25.0)	(632.3)
Intra-entity interest income (expense)	0.0		0.0		0.0	0.0
Interest expense, net	(10.1)		(9.4)		(19.3)	(18.3)
Other non-operating income	0.2		0.5		0.5	1.1
Income (loss) before income taxes	(32.3)		(67.0)		(43.8)	(649.5)
Income taxes	(3.8)		44.0		(2.3)	129.9
Equity in income of subsidiaries	0.0		0.0		0.0	0.0
Net income (loss)	(36.1)	$ (10.0)	(23.0)	$ (496.6)	(46.1)	(519.6)
Dividends on redeemable convertible preferred shares	(8.2)		(8.2)		(16.4)	(16.4)
Net income attributable to common shareholders	(44.3)		(31.2)		(62.5)	(536.0)
Consolidation, Eliminations
Condensed Income Statements, Captions [Line Items]
Sales	0.0		0.0		0.0	0.0
Cost of sales	0.0		0.0		0.0	0.0
Gross margin	0.0		0.0		0.0	0.0
Selling, general and administrative expenses	0.0		0.0		0.0	0.0
Credit transaction, net			0.0			0.0
Restructuring charges	0.0		0.0		0.0	0.0
Goodwill and intangible impairments	0.0				0.0	0.0
Other operating income, net	0.0		0.0		0.0	0.0
Operating income (loss)	0.0		0.0		0.0	0.0
Intra-entity interest income (expense)	0.0		0.0		0.0	0.0
Interest expense, net	0.0		0.0		0.0	0.0
Other non-operating income	0.0		0.0		0.0	0.0
Income (loss) before income taxes	0.0		0.0		0.0	0.0
Income taxes	0.0		0.0		0.0	0.0
Equity in income of subsidiaries	208.9		449.7		363.3	2,078.4
Net income (loss)	208.9		449.7		363.3	2,078.4
Dividends on redeemable convertible preferred shares	0.0		0.0		0.0	0.0
Net income attributable to common shareholders	208.9		449.7		363.3	2,078.4
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Sales	1,258.2		1,296.3		2,575.1	2,652.8
Cost of sales	(831.7)		(867.3)		(1,685.7)	(1,803.6)
Gross margin	424.8		371.5		887.7	791.7
Selling, general and administrative expenses	(407.3)		(407.7)		(869.7)	(852.1)
Credit transaction, net			(23.9)			(167.0)
Restructuring charges	(22.8)		(19.6)		(48.6)	(25.1)
Goodwill and intangible impairments	(35.2)				(35.2)	(448.7)
Other operating income, net	2.0		(1.1)		1.9	21.5
Operating income (loss)	(38.5)		(80.8)		(63.9)	(679.7)
Intra-entity interest income (expense)	(47.8)		(109.1)		(96.2)	(153.9)
Interest expense, net	(5.2)		(4.6)		(9.5)	(8.6)
Other non-operating income	0.2		0.5		0.5	1.1
Income (loss) before income taxes	(91.3)		(194.0)		(169.1)	(841.1)
Income taxes	14.0		25.1		22.8	104.5
Equity in income of subsidiaries	(102.7)		(207.8)		(182.4)	(772.9)
Net income (loss)	(180.0)		(376.7)		(328.7)	(1,509.5)
Dividends on redeemable convertible preferred shares	0.0		0.0		0.0	0.0
Net income attributable to common shareholders	(180.0)		(376.7)		(328.7)	(1,509.5)
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Sales	106.2		123.8		221.0	247.9
Cost of sales	(69.6)		(62.6)		(147.9)	(122.1)
Gross margin	33.9		55.5		70.4	120.1
Selling, general and administrative expenses	(3.9)		(36.7)		(16.7)	(75.0)
Credit transaction, net			0.0			0.0
Restructuring charges	(0.6)		0.0		(1.6)	(1.0)
Goodwill and intangible impairments	(12.5)				(12.5)	0.0
Other operating income, net	(0.6)		4.3		(0.5)	3.9
Operating income (loss)	16.3		23.1		39.1	48.0
Intra-entity interest income (expense)	43.6		106.1		88.0	146.9
Interest expense, net	0.0		0.1		0.1	0.1
Other non-operating income	0.0		0.0		0.0	0.0
Income (loss) before income taxes	59.9		129.3		127.2	195.0
Income taxes	(17.8)		18.8		(25.2)	25.3
Equity in income of subsidiaries	(70.8)		(221.0)		(136.2)	(788.9)
Net income (loss)	(28.7)		(72.9)		(34.2)	(568.6)
Dividends on redeemable convertible preferred shares	0.0		0.0		0.0	0.0
Net income attributable to common shareholders	(28.7)		(72.9)		(34.2)	(568.6)
Signet Jewelers Limited | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Sales	0.0		0.0		0.0	0.0
Cost of sales	0.0		0.0		0.0	0.0
Gross margin	0.0		0.0		0.0	0.0
Selling, general and administrative expenses	(0.2)		(0.4)		(0.2)	(0.5)
Credit transaction, net			0.0			0.0
Restructuring charges	0.0		0.0		0.0	0.0
Goodwill and intangible impairments	0.0				0.0	0.0
Other operating income, net	0.0		0.0		0.0	(0.1)
Operating income (loss)	(0.2)		(0.4)		(0.2)	(0.6)
Intra-entity interest income (expense)	(0.5)		(1.7)		(1.2)	(2.4)
Interest expense, net	0.0		0.0		0.0	0.0
Other non-operating income	0.0		0.0		0.0	0.0
Income (loss) before income taxes	(0.7)		(2.1)		(1.4)	(3.0)
Income taxes	0.0		0.0		0.0	0.0
Equity in income of subsidiaries	(35.4)		(20.9)		(44.7)	(516.6)
Net income (loss)	(36.1)		(23.0)		(46.1)	(519.6)
Dividends on redeemable convertible preferred shares	(8.2)		(8.2)		(16.4)	(16.4)
Net income attributable to common shareholders	(44.3)		(31.2)		(62.5)	(536.0)
Signet UK Finance plc | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Sales	0.0		0.0		0.0	0.0
Cost of sales	0.0		0.0		0.0	0.0
Gross margin	0.0		0.0		0.0	0.0
Selling, general and administrative expenses	0.0		0.0		0.0	0.0
Credit transaction, net			0.0			0.0
Restructuring charges	0.0		0.0		0.0	0.0
Goodwill and intangible impairments	0.0				0.0	0.0
Other operating income, net	0.0		0.0		0.0	0.0
Operating income (loss)	0.0		0.0		0.0	0.0
Intra-entity interest income (expense)	4.7		4.7		9.4	9.4
Interest expense, net	(4.9)		(4.9)		(9.9)	(9.8)
Other non-operating income	0.0		0.0		0.0	0.0
Income (loss) before income taxes	(0.2)		(0.2)		(0.5)	(0.4)
Income taxes	0.0		0.1		0.1	0.1
Equity in income of subsidiaries	0.0		0.0		0.0	0.0
Net income (loss)	(0.2)		(0.1)		(0.4)	(0.3)
Dividends on redeemable convertible preferred shares	0.0		0.0		0.0	0.0
Net income attributable to common shareholders	(0.2)		(0.1)		(0.4)	(0.3)
Restructuring Charges
Condensed Income Statements, Captions [Line Items]
Cost of sales	(4.4)		(63.2)		(4.4)	(63.2)
Restructuring Charges | Consolidation, Eliminations
Condensed Income Statements, Captions [Line Items]
Cost of sales	0.0		0.0		0.0	0.0
Restructuring Charges | Guarantor Subsidiaries | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Cost of sales	(1.7)		(57.5)		(1.7)	(57.5)
Restructuring Charges | Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Cost of sales	(2.7)		(5.7)		(2.7)	(5.7)
Restructuring Charges | Signet Jewelers Limited | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Cost of sales	0.0		0.0		0.0	0.0
Restructuring Charges | Signet UK Finance plc | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Cost of sales	$ 0.0		$ 0.0		$ 0.0	$ 0.0

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