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Restructuring Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 04, 2018
Jul. 29, 2017
Aug. 04, 2018
Jul. 29, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     $ 77.4 $ 0.0
Signet Path to Brillance        
Restructuring Cost and Reserve [Line Items]        
Restructuring plan, length     3 years  
Restructuring charges $ 82.8 $ 0.0 $ 89.3 $ 0.0
Minimum | Signet Path to Brillance        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     170.0  
Cash payments     $ 80.0  
Net reduction in net selling square feet, percent     4.00%  
Maximum | Signet Path to Brillance        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     $ 190.0  
Cash payments     $ 95.0  
Net reduction in net selling square feet, percent     5.00%  
Cost Reduction Activities | Minimum | Signet Path to Brillance        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     $ 125.0  
Cash payments     40.0  
Cost Reduction Activities | Maximum | Signet Path to Brillance        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     135.0  
Cash payments     $ 45.0