Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The carrying amounts of goodwill as of December 31, 2023 and December 25, 2022 by reportable segment are as follows (in millions):

	As of December 31, 2023
	US		KGS		Total
Gross value	$	138.8	$	683.6	$	822.4
Less accumulated impairment	13.8		239.5		253.3
Net	$	125.0	$	444.1	$	569.1

	As of December 25, 2022
	US		KGS		Total
Gross value	$	127.9	$	683.6	$	811.5
Less accumulated impairment	13.8		239.5		253.3
Net	$	114.1	$	444.1	$	558.2

Schedule of Acquired Finite-Lived Intangible Assets

The following table sets forth information for acquired finite-lived and indefinite-lived intangible assets (in millions): 

	As of December 31, 2023						As of December 25, 2022
	Gross Value		Accumulated Amortization		Net Value		Gross Value		Accumulated Amortization		Net Value
Acquired finite-lived intangible assets:
Customer relationships	$	80.9	$	(62.8)	$	18.1	$	80.9	$	(60.1)	$	20.8
Contracts and backlog	53.1		(38.8)		14.3		39.1		(36.3)		2.8
Developed technology and technical know-how	33.7		(28.2)		5.5		33.7		(27.0)		6.7
Trade names	3.8		(2.7)		1.1		3.8		(2.3)		1.5
In-process research and development	16.8		(0.3)		16.5		16.8		(0.3)		16.5
Total finite-lived intangible assets	188.3		(132.8)		55.5		174.3		(126.0)		48.3
Indefinite-lived trade names	6.9		—		6.9		6.9		—		6.9
Total intangible assets	$	195.2	$	(132.8)	$	62.4	$	181.2	$	(126.0)	$	55.2

Schedule of Acquired Indefinite-Lived Intangible Assets

The following table sets forth information for acquired finite-lived and indefinite-lived intangible assets (in millions): 

	As of December 31, 2023						As of December 25, 2022
	Gross Value		Accumulated Amortization		Net Value		Gross Value		Accumulated Amortization		Net Value
Acquired finite-lived intangible assets:
Customer relationships	$	80.9	$	(62.8)	$	18.1	$	80.9	$	(60.1)	$	20.8
Contracts and backlog	53.1		(38.8)		14.3		39.1		(36.3)		2.8
Developed technology and technical know-how	33.7		(28.2)		5.5		33.7		(27.0)		6.7
Trade names	3.8		(2.7)		1.1		3.8		(2.3)		1.5
In-process research and development	16.8		(0.3)		16.5		16.8		(0.3)		16.5
Total finite-lived intangible assets	188.3		(132.8)		55.5		174.3		(126.0)		48.3
Indefinite-lived trade names	6.9		—		6.9		6.9		—		6.9
Total intangible assets	$	195.2	$	(132.8)	$	62.4	$	181.2	$	(126.0)	$	55.2

Schedule of Future Amortization Expense of Finite-Lived Intangible Assets

The estimated future amortization expense of acquired intangible assets with finite lives as of December 31, 2023 is as follows (in millions):

Fiscal Year	Amount
2024	9.4
2025	9.7
2026	9.1
2027	7.4
2028	4.5
Thereafter	15.4
Total	$	55.5