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Restructuring Plans - Schedule of Plan Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		18 Months Ended
	Aug. 03, 2019	Aug. 04, 2018	Aug. 03, 2019	Aug. 04, 2018	Aug. 03, 2019
Restructuring Reserve [Roll Forward]
Charged to expense			$ 14.0	$ 77.4
Signet Path to Brillance
Restructuring Reserve [Roll Forward]
Beginning balance			12.6
Payments and other adjustments			(53.4)
Charged to expense	$ 27.8	$ 82.8	54.6	$ 89.3	$ 180.5
Ending balance	13.8		13.8		13.8
Termination benefits | Signet Path to Brillance
Restructuring Reserve [Roll Forward]
Beginning balance			0.0
Payments and other adjustments			(9.7)
Charged to expense	6.0		14.8		24.5
Ending balance	5.1		5.1		5.1
Store closure and other costs | Signet Path to Brillance
Restructuring Reserve [Roll Forward]
Beginning balance			12.6
Payments and other adjustments			(43.7)
Charged to expense			39.8
Ending balance	$ 8.7		$ 8.7		$ 8.7

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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-Publisher FASB
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585

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

+ References

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-Section S99
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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