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Inventories - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 02, 2019	Nov. 03, 2018	Nov. 02, 2019	Nov. 03, 2018	Feb. 02, 2019
Inventory [Line Items]
Inventory write-down	$ 1.4	$ 0.0	$ 5.8	$ 63.2
Inventory reserves	81.6	89.0	81.6	89.0	$ 95.3
Cost of sales | Signet Path to Brillance
Inventory [Line Items]
Inventory write-down	$ 1.4	$ 0.0	$ 5.8	$ 63.2

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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