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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 02, 2019
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
NextGen Global Resources LLC          
Business Acquisition [Line Items]          
Ownership percentage acquired 100.00%        
Purchase price of acquisition $ 51.0        
Purchase price paid at closing 54.3        
Intangible assets acquired $ 21.5        
Pro forma information, revenue of acquiree since acquisition date, actual   $ 22.7   $ 42.9  
Pro forma information, earnings or loss of acquiree since acquisition date, actual   1.5   2.4  
Business combination, revenue reported by acquired entity for prior period     $ 15.6   $ 28.2
Business combination, net earnings reported by acquired entity for prior period     0.5   0.6
Global Technology Associates, LLC          
Business Acquisition [Line Items]          
Ownership percentage acquired 100.00%        
Purchase price of acquisition $ 34.0        
Purchase price paid at closing 35.7        
Intangible assets acquired 17.3        
Pro forma information, revenue of acquiree since acquisition date, actual   16.7   32.4  
Pro forma information, earnings or loss of acquiree since acquisition date, actual   $ 1.7   $ 2.5  
Business combination, revenue reported by acquired entity for prior period     8.4   16.3
Business combination, net earnings reported by acquired entity for prior period     $ 0.3   $ 0.7
Customer Relationships | NextGen Global Resources LLC          
Business Acquisition [Line Items]          
Intangible assets acquired $ 12.9        
Acquired finite-lived intangible assets, weighted average useful life 10 years        
Customer Relationships | Global Technology Associates, LLC          
Business Acquisition [Line Items]          
Intangible assets acquired $ 12.1        
Acquired finite-lived intangible assets, weighted average useful life 10 years        
Trade Names | NextGen Global Resources LLC          
Business Acquisition [Line Items]          
Intangible assets acquired $ 8.1        
Acquired finite-lived intangible assets, weighted average useful life 15 years        
Trade Names | Global Technology Associates, LLC          
Business Acquisition [Line Items]          
Intangible assets acquired $ 4.0        
Acquired finite-lived intangible assets, weighted average useful life 15 years        
Noncompete Agreements | NextGen Global Resources LLC          
Business Acquisition [Line Items]          
Intangible assets acquired $ 0.5        
Acquired finite-lived intangible assets, weighted average useful life 5 years        
Noncompete Agreements | Global Technology Associates, LLC          
Business Acquisition [Line Items]          
Intangible assets acquired $ 1.2        
Acquired finite-lived intangible assets, weighted average useful life 5 years