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Restructuring Plans - Schedule of Plan Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		21 Months Ended
	Nov. 02, 2019	Nov. 03, 2018	Nov. 02, 2019	Nov. 03, 2018	Nov. 02, 2019
Restructuring Reserve [Roll Forward]
Charged to expense	$ 9.2	$ 9.5	$ 59.4	$ 35.6
Signet Path to Brillance
Restructuring Reserve [Roll Forward]
Beginning balance			12.6
Payments and other adjustments			(66.7)
Charged to expense	10.6	$ 9.5	65.2	$ 98.8	$ 191.1
Ending balance	11.1		11.1		11.1
Termination benefits \| Signet Path to Brillance
Restructuring Reserve [Roll Forward]
Beginning balance			0.0
Payments and other adjustments			(13.6)
Charged to expense	1.0		15.8		25.5
Ending balance	2.2		2.2		2.2
Store closure and other costs \| Signet Path to Brillance
Restructuring Reserve [Roll Forward]
Beginning balance			12.6
Payments and other adjustments			(53.1)
Charged to expense			49.4
Ending balance	$ 8.9		$ 8.9		$ 8.9