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Restructuring Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended			30 Months Ended	36 Months Ended
	Aug. 01, 2020	Aug. 03, 2019	Aug. 04, 2018	Jan. 30, 2021	Aug. 01, 2020	Aug. 03, 2019	Aug. 01, 2020	Feb. 03, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 28.9	$ 23.4			$ 41.6	$ 50.2
Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring plan, length			3 years
Restructuring charges	28.7	$ 27.8			41.0	$ 54.6	$ 246.0
Cash payments					29.3
Restructuring cost incurred to date	$ 246.0				$ 246.0		246.0
Noncash charges							$ 122.3
Scenario, Forecast | Minimum | Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges								$ 200.0
Cash payments				$ 14.0				105.0
Restructuring costs incurred				15.0
Scenario, Forecast | Maximum | Signet Path to Brillance
Restructuring Cost and Reserve [Line Items]
Restructuring charges								220.0
Cash payments				18.0				$ 115.0
Restructuring costs incurred				$ 20.0

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