Condensed Consolidating Financial Information - Condensed Consolidated Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Condensed Statement of Comprehensive Income [Line Items]
Net income	$ 467.9	$ 381.3	$ 368.0
Other comprehensive income (loss):
Foreign currency translation adjustments	(40.2)	(60.6)	12.4
Available-for-sale securities:
Unrealized (loss) gain on securities, net	(0.4)	0.0	0.0
Cash flow hedges:
Unrealized gain (loss)	(11.8)	6.2	(22.0)
Reclassification adjustment for losses to net income	3.5	12.5	6.7
Pension plan:
Actuarial gain (loss)	10.9	(15.8)	0.2
Reclassification adjustment to net income for amortization of actuarial losses	2.7	1.6	1.7
Prior service costs	(0.5)	(0.7)	(0.7)
Reclassification adjustment to net income for amortization of net prior service credits	(1.7)	(1.3)	(1.1)
Total other comprehensive (loss) income	(37.5)	(58.1)	(2.8)
Total comprehensive income	430.4	323.2	365.2
Consolidation, Eliminations
Condensed Statement of Comprehensive Income [Line Items]
Net income	(1,045.4)	(1,529.0)	(1,016.4)
Other comprehensive income (loss):
Foreign currency translation adjustments	40.2	56.5	(11.2)
Available-for-sale securities:
Unrealized (loss) gain on securities, net	0.4	0.0	0.0
Cash flow hedges:
Unrealized gain (loss)	11.8	(6.2)	22.0
Reclassification adjustment for losses to net income	(3.5)	(12.5)	(6.7)
Pension plan:
Actuarial gain (loss)	(10.9)	15.8	(0.2)
Reclassification adjustment to net income for amortization of actuarial losses	(2.7)	(1.6)	(1.7)
Prior service costs	0.5	0.7	0.7
Reclassification adjustment to net income for amortization of net prior service credits	1.7	1.3	1.1
Total other comprehensive (loss) income	37.5	54.0	4.0
Total comprehensive income	(1,007.9)	(1,475.0)	(1,012.4)
Signet Jewelers Limited | Reportable Legal Entities
Condensed Statement of Comprehensive Income [Line Items]
Net income	467.9	381.3	368.0
Other comprehensive income (loss):
Foreign currency translation adjustments	(40.2)	(60.6)	12.4
Available-for-sale securities:
Unrealized (loss) gain on securities, net	(0.4)	0.0	0.0
Cash flow hedges:
Unrealized gain (loss)	(11.8)	6.2	(22.0)
Reclassification adjustment for losses to net income	3.5	12.5	6.7
Pension plan:
Actuarial gain (loss)	10.9	(15.8)	0.2
Reclassification adjustment to net income for amortization of actuarial losses	2.7	1.6	1.7
Prior service costs	(0.5)	(0.7)	(0.7)
Reclassification adjustment to net income for amortization of net prior service credits	(1.7)	(1.3)	(1.1)
Total other comprehensive (loss) income	(37.5)	(58.1)	(2.8)
Total comprehensive income	430.4	323.2	365.2
Signet UK Finance plc | Reportable Legal Entities
Condensed Statement of Comprehensive Income [Line Items]
Net income	(0.9)	(0.6)	0.0
Other comprehensive income (loss):
Foreign currency translation adjustments	0.0	0.0	0.0
Available-for-sale securities:
Unrealized (loss) gain on securities, net	0.0	0.0	0.0
Cash flow hedges:
Unrealized gain (loss)	0.0	0.0	0.0
Reclassification adjustment for losses to net income	0.0	0.0	0.0
Pension plan:
Actuarial gain (loss)	0.0	0.0	0.0
Reclassification adjustment to net income for amortization of actuarial losses	0.0	0.0	0.0
Prior service costs	0.0	0.0	0.0
Reclassification adjustment to net income for amortization of net prior service credits	0.0	0.0	0.0
Total other comprehensive (loss) income	0.0	0.0	0.0
Total comprehensive income	(0.9)	(0.6)	0.0
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Statement of Comprehensive Income [Line Items]
Net income	555.5	837.5	641.4
Other comprehensive income (loss):
Foreign currency translation adjustments	(44.8)	(61.1)	13.9
Available-for-sale securities:
Unrealized (loss) gain on securities, net	0.0	0.0	0.0
Cash flow hedges:
Unrealized gain (loss)	(11.8)	6.2	(22.0)
Reclassification adjustment for losses to net income	3.5	12.5	6.7
Pension plan:
Actuarial gain (loss)	10.9	(15.8)	0.2
Reclassification adjustment to net income for amortization of actuarial losses	2.7	1.6	1.7
Prior service costs	(0.5)	(0.7)	(0.7)
Reclassification adjustment to net income for amortization of net prior service credits	(1.7)	(1.3)	(1.1)
Total other comprehensive (loss) income	(41.7)	(58.6)	(1.3)
Total comprehensive income	513.8	778.9	640.1
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Statement of Comprehensive Income [Line Items]
Net income	490.8	692.1	375.0
Other comprehensive income (loss):
Foreign currency translation adjustments	4.6	4.6	(2.7)
Available-for-sale securities:
Unrealized (loss) gain on securities, net	(0.4)	0.0	0.0
Cash flow hedges:
Unrealized gain (loss)	0.0	0.0	0.0
Reclassification adjustment for losses to net income	0.0	0.0	0.0
Pension plan:
Actuarial gain (loss)	0.0	0.0	0.0
Reclassification adjustment to net income for amortization of actuarial losses	0.0	0.0	0.0
Prior service costs	0.0	0.0	0.0
Reclassification adjustment to net income for amortization of net prior service credits	0.0	0.0	0.0
Total other comprehensive (loss) income	4.2	4.6	(2.7)
Total comprehensive income	$ 495.0	$ 696.7	$ 372.3