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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill The carrying amounts of goodwill as of June 30, 2024 and December 31, 2023 by reportable segment are as follows (in millions):
As of June 30, 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 June 30, 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 $(64.0)$16.9 $80.9 $(62.8)$18.1 
Contracts and backlog53.1 (41.0)12.1 53.1 (38.8)14.3 
Developed technology and technical know-how33.7 (28.8)4.9 33.7 (28.2)5.5 
Trade names3.8 (2.9)0.9 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 (137.1)51.2 188.3 (132.8)55.5 
Indefinite-lived trade names6.9 — 6.9 6.9 — 6.9 
Total intangible assets$195.2 $(137.1)$58.1 $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 June 30, 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 $(64.0)$16.9 $80.9 $(62.8)$18.1 
Contracts and backlog53.1 (41.0)12.1 53.1 (38.8)14.3 
Developed technology and technical know-how33.7 (28.8)4.9 33.7 (28.2)5.5 
Trade names3.8 (2.9)0.9 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 (137.1)51.2 188.3 (132.8)55.5 
Indefinite-lived trade names6.9 — 6.9 6.9 — 6.9 
Total intangible assets$195.2 $(137.1)$58.1 $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 as of June 30, 2024 is as follows (in millions):
Amount
2024$4.2 
20258.9 
20269.1 
20277.4 
20284.5 
Thereafter17.1 
Total$51.2