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Restructuring Plans - Schedule of Plan Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		30 Months Ended
	Aug. 01, 2020	Aug. 03, 2019	Aug. 01, 2020	Aug. 03, 2019	Aug. 01, 2020
Restructuring Reserve [Roll Forward]
Charged to expense	$ 28.9	$ 23.4	$ 41.6	$ 50.2
Signet Path to Brillance
Restructuring Reserve [Roll Forward]
Beginning balance			12.4
Payments and other adjustments			(29.3)
Charged to expense	28.7	$ 27.8	41.0	$ 54.6	$ 246.0
Ending balance	24.1		24.1		24.1
Termination benefits \| Signet Path to Brillance
Restructuring Reserve [Roll Forward]
Beginning balance			2.0
Payments and other adjustments			(7.1)
Charged to expense	20.2		23.1		48.9
Ending balance	18.0		18.0		18.0
Store closure and other costs \| Signet Path to Brillance
Restructuring Reserve [Roll Forward]
Beginning balance			10.4
Payments and other adjustments			(22.2)
Charged to expense			17.9
Ending balance	$ 6.1		$ 6.1		$ 6.1