Goodwill and Other Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions	Dec. 26, 2021	Dec. 27, 2020
Acquired finite-lived intangible assets:
Gross Value	$ 155.0	$ 150.0
Accumulated Amortization	(118.7)	(113.9)
Total	36.3	36.1
Total intangible assets, Gross Value	161.9	156.9
Total intangible assets, Net Value	43.2	43.0
Trade names
Acquired finite-lived intangible assets:
Indefinite-lived trade names	6.9	6.9
Customer relationships
Acquired finite-lived intangible assets:
Gross Value	76.5	75.3
Accumulated Amortization	(57.6)	(55.7)
Total	18.9	19.6
Contracts and backlog
Acquired finite-lived intangible assets:
Gross Value	34.9	33.4
Accumulated Amortization	(33.1)	(31.0)
Total	1.8	2.4
Developed technology and technical know-how
Acquired finite-lived intangible assets:
Gross Value	31.4	29.9
Accumulated Amortization	(25.8)	(25.3)
Total	5.6	4.6
Trade names
Acquired finite-lived intangible assets:
Gross Value	2.7	2.0
Accumulated Amortization	(2.0)	(1.9)
Total	0.7	0.1
In-process research and development
Acquired finite-lived intangible assets:
Gross Value	9.5	9.4
Accumulated Amortization	(0.2)	0.0
Total	$ 9.3	$ 9.4