Intangible assets (Tables)

3 Months Ended

Mar. 28, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

	As of March 28, 2020						As of December 28, 2019
(dollars in millions)	Cost		Accumulated amortization and impairment		Net		Cost		Accumulated amortization and impairment		Net
Finite-lived:
—Customer relationships	$	1,964.8	$	(667.2)	$	1,297.6	$	2,021.8	$	(656.3)	$	1,365.5
—Technology	90.4		(87.8)		2.6		90.8		(87.8)		3.0
—Capitalized software	81.8		(41.5)		40.3		76.1		(38.0)		38.1
	2,137.0		(796.5)		1,340.5		2,188.7		(782.1)		1,406.6
Indefinite-lived:
—Brands and trade names	513.4		(44.0)		469.4		513.4		(44.0)		469.4
Total intangible assets	$	2,650.4	$	(840.5)	$	1,809.9	$	2,702.1	$	(826.1)	$	1,876.0

Schedule of indefinite-lived intangible assets

	As of March 28, 2020						As of December 28, 2019
(dollars in millions)	Cost		Accumulated amortization and impairment		Net		Cost		Accumulated amortization and impairment		Net
Finite-lived:
—Customer relationships	$	1,964.8	$	(667.2)	$	1,297.6	$	2,021.8	$	(656.3)	$	1,365.5
—Technology	90.4		(87.8)		2.6		90.8		(87.8)		3.0
—Capitalized software	81.8		(41.5)		40.3		76.1		(38.0)		38.1
	2,137.0		(796.5)		1,340.5		2,188.7		(782.1)		1,406.6
Indefinite-lived:
—Brands and trade names	513.4		(44.0)		469.4		513.4		(44.0)		469.4
Total intangible assets	$	2,650.4	$	(840.5)	$	1,809.9	$	2,702.1	$	(826.1)	$	1,876.0