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Condensed consolidating financial information - Condensed consolidated statement of comprehensive income (loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 04, 2018 | Jul. 29, 2017 | Aug. 04, 2018 | Jul. 29, 2017
Condensed Statement of Comprehensive Income [Line Items] |  |  |  |  |
Net income |  | $ (23.0) | $ 93.4 | $ (519.6) | $ 171.9
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation adjustments |  | (15.3) | 24.6 | (37.0) | 25.1
Available-for-sale securities: |  |  |  |  |
Unrealized loss | [1] | 0.5 | 0.3 | 0.3 | 0.5
Impact from adoption of new accounting pronouncements | [2] |  |  | (0.8) |
Cash flow hedges: |  |  |  |  |
Unrealized gain |  | (3.0) | (0.9) | (1.5) | 1.8
Reclassification adjustment for losses to net income |  | (0.2) | (1.1) | (0.5) | (2.5)
Pension plan: |  |  |  |  |
Actuarial loss |  | (6.5) | 0.0 | (6.5) | 0.0
Reclassification adjustment to net income for amortization of actuarial loss |  | 0.0 | 0.6 | 0.3 | 1.2
Reclassification adjustment to net income for amortization of prior service credits |  | 0.1 | (0.4) | 0.0 | (0.7)
Total other comprehensive loss |  | (24.4) | 23.1 | (45.7) | 25.4
Total comprehensive loss |  | (47.4) | 116.5 | (565.3) | 197.3
Consolidation, Eliminations |  |  |  |  |
Condensed Statement of Comprehensive Income [Line Items] |  |  |  |  |
Net income |  | 449.7 | (149.4) | 2,078.4 | (259.1)
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation adjustments |  | 15.3 | (24.6) | 37.0 | (25.1)
Available-for-sale securities: |  |  |  |  |
Unrealized loss |  | (0.5) | (0.3) | (0.3) | (0.5)
Impact from adoption of new accounting pronouncements |  |  |  | 0.8 |
Cash flow hedges: |  |  |  |  |
Unrealized gain |  | 3.0 | 0.9 | 1.5 | (1.8)
Reclassification adjustment for losses to net income |  | 0.2 | 1.1 | 0.5 | 2.5
Pension plan: |  |  |  |  |
Actuarial loss |  | 6.5 |  | 6.5 |
Reclassification adjustment to net income for amortization of actuarial loss |  |  | (0.6) | (0.3) | (1.2)
Reclassification adjustment to net income for amortization of prior service credits |  | (0.1) | 0.4 |  | 0.7
Total other comprehensive loss |  | 24.4 | (23.1) | 45.7 | (25.4)
Total comprehensive loss |  | 474.1 | (172.5) | 2,124.1 | (284.5)
Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |
Condensed Statement of Comprehensive Income [Line Items] |  |  |  |  |
Net income |  | (376.7) | 53.2 | (1,509.5) | 82.5
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation adjustments |  | (15.0) | 24.6 | (36.5) | 25.1
Available-for-sale securities: |  |  |  |  |
Unrealized loss |  | 0.0 | 0.0 | 0.0 | 0.0
Impact from adoption of new accounting pronouncements |  |  |  | 0.0 |
Cash flow hedges: |  |  |  |  |
Unrealized gain |  | (3.0) | (0.9) | (1.5) | 1.8
Reclassification adjustment for losses to net income |  | (0.2) | (1.1) | (0.5) | (2.5)
Pension plan: |  |  |  |  |
Actuarial loss |  | (6.5) |  | (6.5) |
Reclassification adjustment to net income for amortization of actuarial loss |  |  | 0.6 | 0.3 | 1.2
Reclassification adjustment to net income for amortization of prior service credits |  | 0.1 | (0.4) |  | (0.7)
Total other comprehensive loss |  | (24.6) | 22.8 | (44.7) | 24.9
Total comprehensive loss |  | (401.3) | 76.0 | (1,554.2) | 107.4
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |
Condensed Statement of Comprehensive Income [Line Items] |  |  |  |  |
Net income |  | (72.9) | 96.4 | (568.6) | 177.0
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation adjustments |  | (0.3) |  | (0.5) |
Available-for-sale securities: |  |  |  |  |
Unrealized loss |  | 0.5 | 0.3 | 0.3 | 0.5
Impact from adoption of new accounting pronouncements |  |  |  | (0.8) |
Cash flow hedges: |  |  |  |  |
Unrealized gain |  | 0.0 | 0.0 | 0.0 | 0.0
Reclassification adjustment for losses to net income |  | 0.0 | 0.0 | 0.0 | 0.0
Pension plan: |  |  |  |  |
Actuarial loss |  | 0.0 |  | 0.0 |
Reclassification adjustment to net income for amortization of actuarial loss |  | 0.0 | 0.0 | 0.0 | 0.0
Reclassification adjustment to net income for amortization of prior service credits |  | 0.0 | 0.0 | 0.0 | 0.0
Total other comprehensive loss |  | 0.2 | 0.3 | (1.0) | 0.5
Total comprehensive loss |  | (72.7) | 96.7 | (569.6) | 177.5
Signet Jewelers Limited | Reportable Legal Entities |  |  |  |  |
Condensed Statement of Comprehensive Income [Line Items] |  |  |  |  |
Net income |  | (23.0) | 93.4 | (519.6) | 171.9
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation adjustments |  | (15.3) | 24.6 | (37.0) | 25.1
Available-for-sale securities: |  |  |  |  |
Unrealized loss |  | 0.5 | 0.3 | 0.3 | 0.5
Impact from adoption of new accounting pronouncements |  |  |  | (0.8) |
Cash flow hedges: |  |  |  |  |
Unrealized gain |  | (3.0) | (0.9) | (1.5) | 1.8
Reclassification adjustment for losses to net income |  | (0.2) | (1.1) | (0.5) | (2.5)
Pension plan: |  |  |  |  |
Actuarial loss |  | (6.5) |  | (6.5) |
Reclassification adjustment to net income for amortization of actuarial loss |  |  | 0.6 | 0.3 | 1.2
Reclassification adjustment to net income for amortization of prior service credits |  | 0.1 | (0.4) |  | (0.7)
Total other comprehensive loss |  | (24.4) | 23.1 | (45.7) | 25.4
Total comprehensive loss |  | (47.4) | 116.5 | (565.3) | 197.3
Signet UK Finance plc | Reportable Legal Entities |  |  |  |  |
Condensed Statement of Comprehensive Income [Line Items] |  |  |  |  |
Net income |  | (0.1) | (0.2) | (0.3) | (0.4)
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation adjustments |  | 0.0 | 0.0 | 0.0 | 0.0
Available-for-sale securities: |  |  |  |  |
Unrealized loss |  | 0.0 | 0.0 | 0.0 | 0.0
Impact from adoption of new accounting pronouncements |  |  |  | 0.0 |
Cash flow hedges: |  |  |  |  |
Unrealized gain |  | 0.0 | 0.0 | 0.0 | 0.0
Reclassification adjustment for losses to net income |  | 0.0 | 0.0 | 0.0 | 0.0
Pension plan: |  |  |  |  |
Actuarial loss |  | 0.0 |  | 0.0 |
Reclassification adjustment to net income for amortization of actuarial loss |  | 0.0 | 0.0 | 0.0 | 0.0
Reclassification adjustment to net income for amortization of prior service credits |  | 0.0 | 0.0 | 0.0 | 0.0
Total other comprehensive loss |  |  |  | 0.0 | 0.0
Total comprehensive loss |  | $ (0.1) | $ (0.2) | $ (0.3) | $ (0.4)
[1] | During the 13 and 26 weeks ended August 4, 2018, amounts represent unrealized gains related to the Company’s available-for-sale debt securities. During the 13 and 26 weeks ended July 29, 2017, amounts represent unrealized gains related to the Company’s available-for-sale debt and equity securities.
[2] | 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 2016-1.

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