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Restructuring plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 24 Months Ended
May 05, 2018
Feb. 01, 2020
Feb. 02, 2019
Feb. 03, 2018
Feb. 01, 2020
Restructuring Cost and Reserve [Line Items]          
Restructuring charges   $ 69.9 $ 63.7 $ 0.0  
Signet Path to Brillance          
Restructuring Cost and Reserve [Line Items]          
Restructuring plan, length 3 years        
Restructuring charges   79.1 125.9   $ 205.0
Payments for restructuring   79.3 113.3    
Restructuring reserve   12.4 $ 12.6 $ 0.0 12.4
Minimum | Signet Path to Brillance          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         200.0
Payments for restructuring         105.0
Maximum | Signet Path to Brillance          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         220.0
Payments for restructuring         115.0
Accrued Expenses And Other Current Liabilities | Signet Path to Brillance          
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve   10.7     10.7
Other Liabilities | Signet Path to Brillance          
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve   $ 1.7     $ 1.7