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Segment Disclosures - Depreciation and Amortization Expense Included in SG&A Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 03, 2021
Sep. 27, 2020
Oct. 03, 2021
Sep. 27, 2020
Earnings (loss) from Operations        
Depreciation and amortization     $ 22.0 $ 18.0
Professional & Industrial        
Earnings (loss) from Operations        
Depreciation and amortization $ 1.3 $ 1.4 4.1 4.1
Science, Engineering & Technology        
Earnings (loss) from Operations        
Depreciation and amortization 3.2 1.0 7.5 3.1
Education        
Earnings (loss) from Operations        
Depreciation and amortization 0.9 0.9 2.8 2.7
Outsourcing & Consulting        
Earnings (loss) from Operations        
Depreciation and amortization 0.1 0.2 0.5 0.5
International        
Earnings (loss) from Operations        
Depreciation and amortization $ 0.5 $ 0.5 $ 1.5 $ 1.6