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Restructuring Plans - Restructuring and Related Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 03, 2018 | Oct. 28, 2017 | Nov. 03, 2018 | Oct. 28, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | $ 80.2 | $ 0.0
Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory charges |  |  | 63.2 |
Restructuring charges | $ 9.5 | $ 0.0 | 98.8 | 0.0
Signet Path to Brillance | Cost of Sales |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory charges | 0.0 | 0.0 |  | 0.0
Signet Path to Brillance | Restructuring Charges |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Other Plan related expenses | $ 9.5 | $ 0.0 | $ 35.6 | $ 0.0

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=68049868&loc=SL66093879-108312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 1C -URI http://asc.fasb.org/extlink&oid=68049868&loc=SL66093883-108312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66092785&loc=d3e4542-108314 + Details
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