Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 26, 2023	Dec. 31, 2023
Acquired finite-lived intangible assets:
Gross Value	$ 188.3		$ 188.3
Accumulated Amortization	(135.0)		(132.8)
Net Value	53.3		55.5
Total intangible assets, Gross value	195.2		195.2
Total intangible assets, Net value	60.2		62.4
Aggregate amortization expense for finite-lived intangible assets	2.1	$ 1.6
Trade names
Acquired finite-lived intangible assets:
Indefinite-lived trade names	6.9		6.9
Customer relationships
Acquired finite-lived intangible assets:
Gross Value	80.9		80.9
Accumulated Amortization	(63.4)		(62.8)
Net Value	17.5		18.1
Contracts and backlog
Acquired finite-lived intangible assets:
Gross Value	53.1		53.1
Accumulated Amortization	(39.9)		(38.8)
Net Value	13.2		14.3
Developed technology and technical know-how
Acquired finite-lived intangible assets:
Gross Value	33.7		33.7
Accumulated Amortization	(28.5)		(28.2)
Net Value	5.2		5.5
Trade names
Acquired finite-lived intangible assets:
Gross Value	3.8		3.8
Accumulated Amortization	(2.8)		(2.7)
Net Value	1.0		1.1
In-process research and development
Acquired finite-lived intangible assets:
Gross Value	16.8		16.8
Accumulated Amortization	(0.4)		(0.3)
Net Value	$ 16.4		$ 16.5