Restructuring - Schedule of Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2019	Sep. 27, 2020
Restructuring Cost and Reserve [Line Items]
Lease Termination Costs		$ 4.8
Severance Costs		3.6
Total		8.4
Professional & Industrial
Restructuring Cost and Reserve [Line Items]
Lease Termination Costs		3.5
Severance Costs		0.8
Total	$ 4.4	4.3
Science, Engineering & Technology
Restructuring Cost and Reserve [Line Items]
Lease Termination Costs		0.5
Severance Costs		0.0
Total	0.5	0.5
Education
Restructuring Cost and Reserve [Line Items]
Lease Termination Costs		0.1
Severance Costs		0.7
Total	0.9	0.8
International
Restructuring Cost and Reserve [Line Items]
Lease Termination Costs		0.7
Severance Costs		0.4
Total	1.1	1.1
Corporate
Restructuring Cost and Reserve [Line Items]
Lease Termination Costs		0.0
Severance Costs		1.7
Total	$ 1.8	$ 1.7