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Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Dec. 29, 2019
Feb. 27, 2019
Dec. 30, 2018
Business Acquisition [Line Items]      
Goodwill $ 455.6   $ 425.7
FTT Inc      
Business Acquisition [Line Items]      
Accounts receivable   $ 8.1  
Unbilled receivables   4.9  
Inventoried costs   7.8  
Other current assets   2.1  
Property and equipment   5.7  
Intangible assets   30.8  
Goodwill   23.0  
Total identifiable net assets acquired   82.4  
Total identifiable net liabilities assumed   (7.5)  
Net assets before noncontrolling interest   74.9  
Noncontrolling interest   (14.9)  
Net assets acquired, excluding cash   $ 60.0