Fair value measurement (Tables)

3 Months Ended

Mar. 30, 2024

Fair Value Disclosures [Abstract]

Schedule of Carrying Amount and Fair Value of Debt

The carrying amount and fair value of our debt are set out below:

	As of March 30, 2024				As of December 30, 2023
(dollars in millions)	Carrying  amount		Fair value		Carrying  amount		Fair value
Current	$	27.9	$	27.8	$	36.5	$	36.5
Non-current	2,313.1		2,340.0		2,415.0		2,444.7
	$	2,341.0	$	2,367.8	$	2,451.5	$	2,481.2

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table categorizes the assets and liabilities that are measured at fair value on a recurring basis:

(dollars in millions)	Quoted prices in active markets (Level 1)		Significant observable inputs (Level 2)		Total
As of March 30, 2024
Derivative assets	$	—	$	53.6	$	53.6
Derivative liabilities	$	—	$	(76.5)	$	(76.5)
Cash equivalents	$	21.3	$	34.0	$	55.3
As of December 30, 2023
Derivative assets	$	—	$	54.1	$	54.1
Derivative liabilities	$	—	$	(103.0)	$	(103.0)
Cash equivalents	$	76.2	$	52.8	$	129.0