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Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 26, 2022
Jun. 27, 2021
Jun. 26, 2022
Jun. 27, 2021
Dec. 26, 2021
Acquired finite-lived intangible assets:          
Gross Value $ 180.0   $ 180.0   $ 155.0
Accumulated Amortization (122.0)   (122.0)   (118.7)
Net Value 58.0   58.0   36.3
Total intangible assets: gross value 186.9   186.9   161.9
Total intangible assets: net value 64.9   64.9   43.2
Aggregate amortization expense for finite-lived intangible assets 1.6 $ 1.2 3.3 $ 2.6  
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 80.5   80.5   76.5
Accumulated Amortization (58.8)   (58.8)   (57.6)
Net Value 21.7   21.7   18.9
Contracts and backlog          
Acquired finite-lived intangible assets:          
Gross Value 43.9   43.9   34.9
Accumulated Amortization (34.4)   (34.4)   (33.1)
Net Value 9.5   9.5   1.8
Developed technology and technical know-how          
Acquired finite-lived intangible assets:          
Gross Value 39.6   39.6   31.4
Accumulated Amortization (26.3)   (26.3)   (25.8)
Net Value 13.3   13.3   5.6
Trade names          
Acquired finite-lived intangible assets:          
Gross Value 5.0   5.0   2.7
Accumulated Amortization (2.2)   (2.2)   (2.0)
Net Value 2.8   2.8   0.7
In-process research and development          
Acquired finite-lived intangible assets:          
Gross Value 11.0   11.0   9.5
Accumulated Amortization (0.3)   (0.3)   (0.2)
Net Value $ 10.7   $ 10.7   $ 9.3