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Restructuring plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 36 Months Ended
May 05, 2018
Jan. 30, 2021
Feb. 01, 2020
Feb. 02, 2019
Jan. 30, 2021
Feb. 03, 2018
Restructuring Cost and Reserve [Line Items]            
Restructuring charges   $ 46.2 $ 69.9 $ 63.7    
Signet Path to Brillance            
Restructuring Cost and Reserve [Line Items]            
Restructuring plan, length 3 years          
Restructuring charges   47.6 79.1 125.9 $ 252.6  
Payments for restructuring   49.8 79.3 113.3    
Restructuring reserve   10.2 $ 12.4 $ 12.6 10.2 $ 0.0
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   8.6     8.6  
Other Noncurrent Liabilities | Signet Path to Brillance            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve   $ 1.6     $ 1.6