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Restructuring - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Dec. 30, 2018
Restructuring Cost and Reserve [Line Items]      
Restructuring costs   $ 5.7  
Restructuring accrual $ 6.1 $ 2.4 $ 0.0
Americas Staffing      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 6.3