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Restructuring plans - Schedule of Plan Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		42 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Jul. 31, 2021	Aug. 01, 2020	Jul. 31, 2021
Restructuring Reserve [Roll Forward]
Charged (credited) to expense	$ (0.9)	$ 28.9	$ (1.6)	$ 41.6
Signet Path to Brilliance
Restructuring Reserve [Roll Forward]
Beginning balance			10.2
Payments and other adjustments			(1.4)
Charged (credited) to expense	(0.9)	$ 28.7	(1.6)	$ 41.0	$ 251.0
Ending balance	7.2		7.2		7.2
Termination benefits | Signet Path to Brilliance
Restructuring Reserve [Roll Forward]
Beginning balance			2.1
Payments and other adjustments			(0.9)
Charged (credited) to expense	(0.4)		(1.1)		48.8
Ending balance	0.1		0.1		0.1
Store closure and other costs | Signet Path to Brilliance
Restructuring Reserve [Roll Forward]
Beginning balance			8.1
Payments and other adjustments			(0.5)
Charged (credited) to expense			(0.5)
Ending balance	$ 7.1		$ 7.1		$ 7.1

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)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123570139&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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

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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

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)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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