Intangible assets (Tables)

9 Months Ended

Sep. 29, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

	As of September 29, 2018							As of December 30, 2017
(dollars in millions)	Cost		Accumulated amortization and impairment			Net		Cost		Accumulated amortization and impairment			Net
Finite-lived:
—Customer relationships	$	2,025.9	$	(509.7	)	$	1,516.2	$	2,051.1	$	(424.4	)	$	1,626.7
—Technology	90.7		(86.8		)	3.9		90.8		(86.2		)	4.6
—Capitalized software	59.6		(27.1		)	32.5		48.3		(22.2		)	26.1
	2,176.2		(623.6		)	1,552.6		2,190.2		(532.8		)	1,657.4
Indefinite-lived:
—Brands and trade names	513.4		(44.0		)	469.4		513.4		(44.0		)	469.4
Total intangible assets	$	2,689.6	$	(667.6	)	$	2,022.0	$	2,703.6	$	(576.8	)	$	2,126.8

Schedule of indefinite-lived intangible assets

	As of September 29, 2018							As of December 30, 2017
(dollars in millions)	Cost		Accumulated amortization and impairment			Net		Cost		Accumulated amortization and impairment			Net
Finite-lived:
—Customer relationships	$	2,025.9	$	(509.7	)	$	1,516.2	$	2,051.1	$	(424.4	)	$	1,626.7
—Technology	90.7		(86.8		)	3.9		90.8		(86.2		)	4.6
—Capitalized software	59.6		(27.1		)	32.5		48.3		(22.2		)	26.1
	2,176.2		(623.6		)	1,552.6		2,190.2		(532.8		)	1,657.4
Indefinite-lived:
—Brands and trade names	513.4		(44.0		)	469.4		513.4		(44.0		)	469.4
Total intangible assets	$	2,689.6	$	(667.6	)	$	2,022.0	$	2,703.6	$	(576.8	)	$	2,126.8