Significant accounting policies (Tables)

12 Months Ended

Dec. 30, 2023

Accounting Policies [Abstract]

Schedule of Finite-Lived Intangible Assets Acquired Amortization Schedule

An acquired intangible asset with a finite useful life is amortized on a straight-line basis so as to charge its cost, which represents its fair value at the date of acquisition, to net income over the Company’s expectation of its useful life, as follows:

Customer relationships	15 to 17 years
Technology	5 to 7 years

Schedule of Property Plant, and Equipment

The Company’s estimated useful lives of items of property, plant and equipment are generally in the following ranges:

Buildings and improvements	30 to 40 years
Leasehold improvements	Shorter of lease term or useful life
Machinery, equipment and vehicles	2 to 20 years

(dollars in millions)	As of December 30, 2023		As of December 31, 2022
Cost
Land and buildings	$	335.0	$	321.4
Machinery, equipment and vehicles	996.8		884.6
Assets under construction	55.1		100.9
	1,386.9		1,306.9
Less: Accumulated depreciation and impairment	(756.9)		(669.4)
Total	$	630.0	$	637.5