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Intangible Assets, Net
12 Months Ended
Jan. 02, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net Intangible Assets, Net
The following table summarizes intangible assets, net as of January 2, 2021 and December 28, 2019:

 January 2, 2021December 28, 2019
(in millions of U.S. dollars)CostAccumulated AmortizationNetCostAccumulated AmortizationNet
Intangible Assets
Not subject to amortization
Trademarks$455.5 $— $455.5 $287.1 $— $287.1 
Total intangible assets not subject to amortization$455.5 $— $455.5 $287.1 $— $287.1 
Subject to amortization
Customer relationships809.5 324.3 485.2 534.9 267.5 267.4 
Patents19.2 6.4 12.8 15.2 4.0 11.2 
Software62.5 38.2 24.3 49.4 28.0 21.4 
Other15.9 6.1 9.8 14.9 5.0 9.9 
Total intangible assets subject to amortization$907.1 $375.0 $532.1 $614.4 $304.5 $309.9 
Total intangible assets$1,362.6 $375.0 $987.6 $901.5 $304.5 $597.0 

Amortization expense of intangible assets was $63.3 million during 2020 (2019 - $56.5 million; 2018 - $63.0 million).
The estimated amortization expense for intangible assets subject to amortization over the next five years is:

(in millions of U.S. dollars)
2021$60.3 
202256.4 
202348.0 
202441.4 
202535.6 
Thereafter290.4 
Total$532.1