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Goodwill and Intangible Assets
 9 Months Ended
Sep. 25, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
 
(a)    Goodwill
 
    The carrying amounts of goodwill as of September 25, 2022 and December 26, 2021 by reportable segment are as follows (in millions):
As of September 25, 2022
KGSUSTotal
Gross value$677.2 $127.9 $805.1 
Less accumulated impairment239.5 13.8 253.3 
Net$437.7 $114.1 $551.8 
As of December 26, 2021
KGSUSTotal
Gross value$619.3 $127.9 $747.2 
Less accumulated impairment239.5 13.8 253.3 
Net$379.8 $114.1 $493.9 

(b)    Purchased Intangible Assets
 
The following table sets forth information for finite-lived and indefinite-lived intangible assets (in millions): 
 As of September 25, 2022As of December 26, 2021
 Gross
Value		Accumulated
Amortization		Net
Value		Gross
Value		Accumulated
Amortization		Net
Value
Acquired finite-lived intangible assets:    
Customer relationships$80.5 $(59.5)$21.0 $76.5 $(57.6)$18.9 
Contracts and backlog43.9 (36.1)7.8 34.9 (33.1)1.8 
Developed technology and technical know-how39.6 (26.8)12.8 31.4 (25.8)5.6 
Trade names5.0 (2.4)2.6 2.7 (2.0)0.7 
In-process research and development11.0 (0.2)10.8 9.5 (0.2)9.3 
Total finite-lived intangible assets180.0 (125.0)55.0 155.0 (118.7)36.3 
Indefinite-lived trade names6.9 — 6.9 6.9 — 6.9 
Total intangible assets$186.9 $(125.0)$61.9 $161.9 $(118.7)$43.2 
Consolidated amortization expense related to intangible assets subject to amortization was $3.0 million and $1.1 million for the three months ended September 25, 2022 and September 26, 2021, respectively, and $6.3 million and $3.7 million for the nine months ended September 25, 2022 and September 26, 2021, respectively