Intangible assets (Tables)

6 Months Ended

Jun. 27, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

	As of June 27, 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	$	1,982.0	$	(702.5)	$	1,279.5	$	2,021.8	$	(656.3)	$	1,365.5
—Technology	90.4		(87.9)		2.5		90.8		(87.8)		3.0
—Capitalized software	83.7		(43.9)		39.8		76.1		(38.0)		38.1
	2,156.1		(834.3)		1,321.8		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	$	2,669.5	$	(878.3)	$	1,791.2	$	2,702.1	$	(826.1)	$	1,876.0

Schedule of indefinite-lived intangible assets

	As of June 27, 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	$	1,982.0	$	(702.5)	$	1,279.5	$	2,021.8	$	(656.3)	$	1,365.5
—Technology	90.4		(87.9)		2.5		90.8		(87.8)		3.0
—Capitalized software	83.7		(43.9)		39.8		76.1		(38.0)		38.1
	2,156.1		(834.3)		1,321.8		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	$	2,669.5	$	(878.3)	$	1,791.2	$	2,702.1	$	(826.1)	$	1,876.0