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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 29, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill The carrying amounts of goodwill as of September 29, 2024 and December 31, 2023 by reportable segment are as follows (in millions):
As of September 29, 2024
KGSUSTotal
Gross value$683.6 $138.6 $822.2 
Less accumulated impairment239.5 13.8 253.3 
Net$444.1 $124.8 $568.9 

As of December 31, 2023
KGSUSTotal
Gross value$683.6 $138.8 822.4 
Less accumulated impairment239.5 13.8 253.3 
Net$444.1 $125.0 $569.1 
Schedule of Intangible Assets (Finite-Lived)
The following table sets forth information for finite-lived and indefinite-lived intangible assets (in millions): 
 As of September 29, 2024As of December 31, 2023
 Gross
Value		Accumulated
Amortization		Net
Value		Gross
Value		Accumulated
Amortization		Net
Value
Acquired finite-lived intangible assets:    
Customer relationships$80.9 $(64.7)$16.2 $80.9 $(62.8)$18.1 
Contracts and backlog53.1 (42.1)11.0 53.1 (38.8)14.3 
Developed technology and technical know-how33.7 (29.1)4.6 33.7 (28.2)5.5 
Trade names3.8 (3.0)0.8 3.8 (2.7)1.1 
In-process research and development16.8 (0.4)16.4 16.8 (0.3)16.5 
Total finite-lived intangible assets188.3 (139.3)49.0 188.3 (132.8)55.5 
Indefinite-lived trade names6.9 — 6.9 6.9 — 6.9 
Total intangible assets$195.2 $(139.3)$55.9 $195.2 $(132.8)$62.4 
Schedule of Intangible Assets (Indefinite-Lived)
The following table sets forth information for finite-lived and indefinite-lived intangible assets (in millions): 
 As of September 29, 2024As of December 31, 2023
 Gross
Value		Accumulated
Amortization		Net
Value		Gross
Value		Accumulated
Amortization		Net
Value
Acquired finite-lived intangible assets:    
Customer relationships$80.9 $(64.7)$16.2 $80.9 $(62.8)$18.1 
Contracts and backlog53.1 (42.1)11.0 53.1 (38.8)14.3 
Developed technology and technical know-how33.7 (29.1)4.6 33.7 (28.2)5.5 
Trade names3.8 (3.0)0.8 3.8 (2.7)1.1 
In-process research and development16.8 (0.4)16.4 16.8 (0.3)16.5 
Total finite-lived intangible assets188.3 (139.3)49.0 188.3 (132.8)55.5 
Indefinite-lived trade names6.9 — 6.9 6.9 — 6.9 
Total intangible assets$195.2 $(139.3)$55.9 $195.2 $(132.8)$62.4 
Schedule of Future Amortization Expense of Acquired Intangibles
The estimated future amortization expense of acquired intangible assets with finite lives for the remainder of 2024 and the next five fiscal years, and thereafter as of September 29, 2024 is as follows (in millions):
Amount
2024$2.1 
20258.9 
20269.1 
20277.3 
20284.5 
20294.5 
Thereafter
$12.6