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Condensed Consolidating Financial Information - Condensed Consolidated Statement of Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Feb. 03, 2018
Oct. 28, 2017
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jul. 30, 2016
Apr. 30, 2016
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Condensed Statement of Comprehensive Income [Line Items]                      
Net income $ 343.0 $ (12.1) $ 85.2 $ 70.3 $ 287.8 $ 14.8 $ 81.9 $ 146.8 $ 519.3 $ 543.2 $ 467.9
Other comprehensive (loss) income:                      
Foreign currency translation adjustments                 50.9 (25.6) (40.2)
Available-for-sale securities:                      
Unrealized gain (loss)                 0.3 0.0 (0.4)
Cash flow hedges:                      
Unrealized gain (loss)                 1.8 6.9 (11.8)
Reclassification adjustment for losses to net income                 (3.5) (0.6) 3.5
Pension plan:                      
Actuarial gain (loss)                 0.0 (13.6) 10.9
Reclassification adjustment to net income for amortization of actuarial losses                 2.2 1.2 2.7
Prior service costs                 (0.5) (0.4) (0.5)
Reclassification adjustment to net income for amortization of net prior service credits                 (1.1) (1.5) (1.7)
Net curtailment gain and settlement loss                 (3.0) 0.0 0.0
Total other comprehensive (loss) income                 47.1 (33.6) (37.5)
Total comprehensive income                 566.4 509.6 430.4
Consolidation, Eliminations                      
Condensed Statement of Comprehensive Income [Line Items]                      
Net income                 (983.8) (1,116.6) (1,045.4)
Other comprehensive (loss) income:                      
Foreign currency translation adjustments                 (50.9) 25.6 40.2
Available-for-sale securities:                      
Unrealized gain (loss)                 (0.3) 0.0 0.4
Cash flow hedges:                      
Unrealized gain (loss)                 (1.8) (6.9) 11.8
Reclassification adjustment for losses to net income                 3.5 0.6 (3.5)
Pension plan:                      
Actuarial gain (loss)                   13.6 (10.9)
Reclassification adjustment to net income for amortization of actuarial losses                 (2.2) (1.2) (2.7)
Prior service costs                 0.5 0.4 0.5
Reclassification adjustment to net income for amortization of net prior service credits                 1.1 1.5 1.7
Net curtailment gain and settlement loss                 3.0    
Total other comprehensive (loss) income                 (47.1) 33.6 37.5
Total comprehensive income                 (1,030.9) (1,083.0) (1,007.9)
Guarantor Subsidiaries | Reportable Legal Entities                      
Condensed Statement of Comprehensive Income [Line Items]                      
Net income                 459.9 559.7 555.5
Other comprehensive (loss) income:                      
Foreign currency translation adjustments                 50.2 (31.2) (44.8)
Available-for-sale securities:                      
Unrealized gain (loss)                 0.0 0.0 0.0
Cash flow hedges:                      
Unrealized gain (loss)                 1.8 6.9 (11.8)
Reclassification adjustment for losses to net income                 (3.5) (0.6) 3.5
Pension plan:                      
Actuarial gain (loss)                   (13.6) 10.9
Reclassification adjustment to net income for amortization of actuarial losses                 2.2 1.2 2.7
Prior service costs                 (0.5) (0.4) (0.5)
Reclassification adjustment to net income for amortization of net prior service credits                 (1.1) (1.5) (1.7)
Net curtailment gain and settlement loss                 (3.0)    
Total other comprehensive (loss) income                 46.1 (39.2) (41.7)
Total comprehensive income                 506.0 520.5 513.8
Non-Guarantor Subsidiaries | Reportable Legal Entities                      
Condensed Statement of Comprehensive Income [Line Items]                      
Net income                 524.8 557.7 490.8
Other comprehensive (loss) income:                      
Foreign currency translation adjustments                 0.7 5.6 4.6
Available-for-sale securities:                      
Unrealized gain (loss)                 0.3 0.0 (0.4)
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
Net curtailment gain and settlement loss                 0.0    
Total other comprehensive (loss) income                 1.0 5.6 4.2
Total comprehensive income                 525.8 563.3 495.0
Signet Jewelers Limited | Reportable Legal Entities                      
Condensed Statement of Comprehensive Income [Line Items]                      
Net income                 519.3 543.2 467.9
Other comprehensive (loss) income:                      
Foreign currency translation adjustments                 50.9 (25.6) (40.2)
Available-for-sale securities:                      
Unrealized gain (loss)                 0.3 0.0 (0.4)
Cash flow hedges:                      
Unrealized gain (loss)                 1.8 6.9 (11.8)
Reclassification adjustment for losses to net income                 (3.5) (0.6) 3.5
Pension plan:                      
Actuarial gain (loss)                   (13.6) 10.9
Reclassification adjustment to net income for amortization of actuarial losses                 2.2 1.2 2.7
Prior service costs                 (0.5) (0.4) (0.5)
Reclassification adjustment to net income for amortization of net prior service credits                 (1.1) (1.5) (1.7)
Net curtailment gain and settlement loss                 (3.0)    
Total other comprehensive (loss) income                 47.1 (33.6) (37.5)
Total comprehensive income                 566.4 509.6 430.4
Signet UK Finance plc | Reportable Legal Entities                      
Condensed Statement of Comprehensive Income [Line Items]                      
Net income                 (0.9) (0.8) (0.9)
Other comprehensive (loss) income:                      
Foreign currency translation adjustments                 0.0 0.0 0.0
Available-for-sale securities:                      
Unrealized gain (loss)                 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
Net curtailment gain and settlement loss                 0.0    
Total other comprehensive (loss) income                 0.0 0.0 0.0
Total comprehensive income                 $ (0.9) $ (0.8) $ (0.9)