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Fair value measurement (Tables)
 12 Months Ended
Jan. 29, 2022
Fair Value Disclosures [Abstract]  
Methods to Determine Fair Value on Instrument-Specific Basis The methods Signet uses to determine fair value on an instrument-specific basis are detailed below:
January 29, 2022January 30, 2021
(in millions)Carrying ValueLevel 1
Level 2		Carrying ValueLevel 1Level 2
Assets:
US Treasury securities
$4.5 $4.5 $— $5.7 $5.7 $— 
Foreign currency contracts
0.3 — 0.3 0.1 — 0.1 
US government agency securities
2.0 — 2.0 3.2 — 3.2 
Corporate bonds and notes
5.8 — 5.8 6.5 — 6.5 
Total assets
$12.6 $4.5 $8.1 $15.5 $5.7 $9.8 
Liabilities:
Foreign currency contracts
$(1.3)$— $(1.3)$(0.3)$— $(0.3)
Commodity contracts
— — — (0.1)— (0.1)
Total liabilities $(1.3)$— $(1.3)$(0.4)$— $(0.4)
Schedule of Carrying Amount and Fair Value of Outstanding Debt The following table provides a summary of the carrying amount and fair value of outstanding debt:
January 29, 2022January 30, 2021
(in millions) Carrying
Value		Fair ValueCarrying
Value		Fair Value
Long-term debt
Senior Notes (Level 2)
$147.1 $150.0 $146.7 $145.1