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Goodwill and Intangible Assets
 9 Months Ended
Sep. 26, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
 
(a)    Goodwill
 
    The carrying amounts of goodwill as of September 26, 2021 and December 27, 2020 by reportable segment are as follows (in millions):
As of September 26, 2021
KGSUSTotal
Gross value$609.6 $127.4 $737.0 
Less accumulated impairment239.5 13.8 253.3 
Net$370.1 $113.6 $483.7 

As of December 27, 2020
KGSUSTotal
Gross value$609.6 $127.6 $737.2 
Less accumulated impairment239.5 13.8 253.3 
Net$370.1 $113.8 $483.9 

(b)    Purchased Intangible Assets
 
The following table sets forth information for finite-lived and indefinite-lived intangible assets (in millions): 
 As of September 26, 2021As of December 27, 2020
 Gross
Value		Accumulated
Amortization		Net
Value		Gross
Value		Accumulated
Amortization		Net
Value
Acquired finite-lived intangible assets:    
Customer relationships$75.3 $(57.1)$18.2 $75.3 $(55.7)$19.6 
Contracts and backlog33.4 (32.7)0.7 33.4 (31.0)2.4 
Developed technology and technical know-how29.9 (25.7)4.2 29.9 (25.3)4.6 
Trade names2.0 (2.0)— 2.0 (1.9)0.1 
In-process research and development9.4 (0.1)9.3 9.4 — 9.4 
Total finite-lived intangible assets150.0 (117.6)32.4 150.0 (113.9)36.1 
Indefinite-lived trade names6.9 — 6.9 6.9 — 6.9 
Total intangible assets$156.9 $(117.6)$39.3 $156.9 $(113.9)$43.0 

Consolidated amortization expense related to intangible assets subject to amortization was $1.1 million and $1.7 million for the three months ended September 26, 2021 and September 27, 2020, respectively, and $3.7 million and $5.4 million for the nine months ended September 26, 2021 and September 27, 2020, respectively.