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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
 
(a)    Goodwill
 
    The carrying amounts of goodwill as of March 31, 2024 and December 31, 2023 by reportable segment are as follows (in millions):
As of March 31, 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 

(b)    Purchased Intangible Assets
 
The following table sets forth information for finite-lived and indefinite-lived intangible assets (in millions): 
 As of March 31, 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 $(63.4)$17.5 $80.9 $(62.8)$18.1 
Contracts and backlog53.1 (39.9)13.2 53.1 (38.8)14.3 
Developed technology and technical know-how33.7 (28.5)5.2 33.7 (28.2)5.5 
Trade names3.8 (2.8)1.0 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 (135.0)53.3 188.3 (132.8)55.5 
Indefinite-lived trade names6.9 — 6.9 6.9 — 6.9 
Total intangible assets$195.2 $(135.0)$60.2 $195.2 $(132.8)$62.4 

Consolidated amortization expense related to intangible assets subject to amortization was $2.1 million and $1.6 million for the three months ended March 31, 2024 and March 26, 2023, respectively.

The estimated future amortization expense of acquired intangible assets with finite lives as of March 31, 2024 is as follows (in millions):
Amount
2024$7.1 
20259.7 
20269.1 
20277.3 
20284.5 
Thereafter15.6 
Total$53.3