Retirement plans - Changes in Fair Value of Level 3 Investment Assets (Details) - Pension plan - Foreign Plan - USD ($) $ in Millions	12 Months Ended
Jan. 28, 2023	Jan. 29, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	$ 295.6	$ 299.2
Actual return on assets, assets still held at reporting date	(28.4)	(0.3)
Foreign currency translation	(12.2)	(6.8)
Fair value at end of year	2.7	295.6
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	291.6	0.0
Purchases, sales, and settlements, net	(262.7)	318.3
Actual return on assets, assets still held at reporting date	(16.1)	(16.8)
Foreign currency translation	(11.2)	(9.9)
Fair value at end of year	$ 1.6	$ 291.6

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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+ Details

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

+ References

+ Details

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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

+ Details

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