Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024	Dec. 29, 2024
Acquired finite-lived intangible assets:
Gross Value	$ 198.3		$ 198.3		$ 188.3
Accumulated Amortization	(146.3)		(146.3)		(141.4)
Net Value	52.0		52.0		46.9
Total intangible assets, gross value	205.2		205.2		195.2
Total intangible assets, net value	58.9		58.9		53.8
Aggregate amortization expense for finite-lived intangible assets	2.8	$ 2.2	4.9	$ 4.3
Trade names
Acquired finite-lived intangible assets:
Indefinite-lived trade names	6.9		6.9		6.9
Customer relationships
Acquired finite-lived intangible assets:
Gross Value	83.4		83.4		80.9
Accumulated Amortization	(66.8)		(66.8)		(65.3)
Net Value	16.6		16.6		15.6
Contracts and backlog
Acquired finite-lived intangible assets:
Gross Value	56.1		56.1		53.1
Accumulated Amortization	(45.5)		(45.5)		(43.2)
Net Value	10.6		10.6		9.9
Non-compete Agreements
Acquired finite-lived intangible assets:
Gross Value	0.5		0.5		0.0
Accumulated Amortization	0.0		0.0		0.0
Net Value	0.5		0.5		0.0
Developed technology and technical know-how
Acquired finite-lived intangible assets:
Gross Value	35.7		35.7		33.7
Accumulated Amortization	(30.1)		(30.1)		(29.4)
Net Value	5.6		5.6		4.3
Trade names
Acquired finite-lived intangible assets:
Gross Value	5.8		5.8		3.8
Accumulated Amortization	(3.4)		(3.4)		(3.1)
Net Value	2.4		2.4		0.7
In-process research and development
Acquired finite-lived intangible assets:
Gross Value	16.8		16.8		16.8
Accumulated Amortization	(0.5)		(0.5)		(0.4)
Net Value	$ 16.3		$ 16.3		$ 16.4