Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 26, 2023	Mar. 27, 2022	Dec. 25, 2022
Acquired finite-lived intangible assets:
Gross Value	$ 174.3		$ 174.3
Accumulated Amortization	(127.6)		(126.0)
Net Value	46.7		48.3
Total intangible assets, Gross value	181.2		181.2
Total intangible assets, Net value	53.6		55.2
Aggregate amortization expense for finite-lived intangible assets	1.6	$ 1.7
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	(60.8)		(60.1)
Net Value	20.1		20.8
Contracts and backlog
Acquired finite-lived intangible assets:
Gross Value	39.1		39.1
Accumulated Amortization	(36.8)		(36.3)
Net Value	2.3		2.8
Developed technology and technical know-how
Acquired finite-lived intangible assets:
Gross Value	33.7		33.7
Accumulated Amortization	(27.3)		(27.0)
Net Value	6.4		6.7
Trade names
Acquired finite-lived intangible assets:
Gross Value	3.8		3.8
Accumulated Amortization	(2.4)		(2.3)
Net Value	1.4		1.5
In-process research and development
Acquired finite-lived intangible assets:
Gross Value	16.8		16.8
Accumulated Amortization	(0.3)		(0.3)
Net Value	$ 16.5		$ 16.5