Goodwill and Other Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions	Dec. 25, 2022	Dec. 26, 2021
Acquired finite-lived intangible assets:
Gross Value	$ 174.3	$ 155.0
Accumulated Amortization	(126.0)	(118.7)
Total	48.3	36.3
Total intangible assets, Gross Value	181.2	161.9
Total intangible assets, Net Value	55.2	43.2
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	76.5
Accumulated Amortization	(60.1)	(57.6)
Total	20.8	18.9
Contracts and backlog
Acquired finite-lived intangible assets:
Gross Value	39.1	34.9
Accumulated Amortization	(36.3)	(33.1)
Total	2.8	1.8
Developed technology and technical know-how
Acquired finite-lived intangible assets:
Gross Value	33.7	31.4
Accumulated Amortization	(27.0)	(25.8)
Total	6.7	5.6
Trade names
Acquired finite-lived intangible assets:
Gross Value	3.8	2.7
Accumulated Amortization	(2.3)	(2.0)
Total	1.5	0.7
In-process research and development
Acquired finite-lived intangible assets:
Gross Value	16.8	9.5
Accumulated Amortization	(0.3)	(0.2)
Total	$ 16.5	$ 9.3