Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_OtherRestructuringCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring Plans - Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		15 Months Ended
	May 04, 2019	May 05, 2018	May 04, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5.4	$ 0.0
Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	26.8	6.5	$ 152.7
Signet Path to Brillance \| Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Other Plan related expenses	26.8	$ 6.5
Inventory charges \| Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0		62.2
Termination benefits \| Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	8.8		18.5
Store closure and other costs \| Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 18.0		$ 72.0