Intangible assets (Tables)

12 Months Ended

Dec. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

The following table summarizes intangible assets as of December 30, 2017 and December 31, 2016:

	December 30, 2017						December 31, 2016
(in millions of U.S. dollars)	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Intangibles
Not subject to amortization
Rights 1	$	24.5		—	$	24.5	$	24.5		—	$	24.5
Trademarks		264.1		—		264.1		257.1		—		257.1
Total intangibles not subject to amortization	$	288.6		—	$	288.6	$	281.6		—	$	281.6
Subject to amortization
Customer relationships		583.4		154.7		428.7		552.3		94.3		458.0
Patents		15.2		1.0		14.2		—		—		—
Software		28.8		13.0		15.8		20.5		6.3		14.2
Other		8.0		4.2		3.8		7.3		2.1		5.2
Total intangibles subject to amortization	$	635.4	$	172.9	$	462.5	$	580.1	$	102.7	$	477.4
Total intangible assets	$	924.0	$	172.9	$	751.1	$	861.7	$	102.7	$	759.0

^1. Relates to the 2001 acquisition of the Rights.

Estimated Amortization Expense for Intangible Assets

The estimated amortization expense for intangible assets subject to amortization over the next five years is:

(in millions of U.S. dollars)
2018	$	67.8
2019		60.3
2020		51.3
2021		44.4
2022		38.7
Thereafter		200.0
Total	$	462.5