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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Sep. 26, 2021
Dec. 27, 2020
Jun. 15, 2020
Business Acquisition [Line Items]      
Goodwill $ 483.7 $ 483.9  
CPI ASC Signal Division, Inc.      
Business Acquisition [Line Items]      
Accounts receivable     $ 5.7
Unbilled receivables     0.9
Inventoried costs     10.4
Other current assets     1.8
Property and equipment     10.0
Intangible assets     4.3
Goodwill     10.8
Total identifiable net assets acquired     43.9
Total identifiable net liabilities assumed     (11.0)
Net assets acquired, excluding cash     $ 32.9