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Fair value measurement (Tables)
 12 Months Ended
Jan. 30, 2021
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 30, 2021February 1, 2020
(in millions)Carrying ValueLevel 1
Level 2		Carrying ValueLevel 1Level 2
Assets:
US Treasury securities
$5.7 $5.7 $— $7.2 $7.2 $— 
Foreign currency contracts
0.1 — 0.1 0.6 — 0.6 
Commodity contracts
— — — 11.8 — 11.8 
US government agency securities
3.2 — 3.2 4.7 — 4.7 
Corporate bonds and notes
6.5 — 6.5 8.5 — 8.5 
Total assets
$15.5 $5.7 $9.8 $32.8 $7.2 $25.6 
Liabilities:
Foreign currency contracts
$(0.3)$— $(0.3)$(0.9)$— $(0.9)
Commodity contracts
(0.1)— (0.1)— — — 
Total liabilities $(0.4)$— $(0.4)$(0.9)$— $(0.9)
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 30, 2021February 1, 2020
(in millions) Carrying
Value		Fair ValueCarrying
Value		Fair Value
Long-term debt
Senior Notes (Level 2)
$146.7 $145.1 $146.4 $144.8 
Term loans (Level 2)
— — 99.5 100.0 
Total
$146.7 $145.1 $245.9 $244.8