Retirement and Other Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 27, 2020	Mar. 29, 2019
Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.6	$ 1.4
Interest cost	1.5	1.7
Expected return on assets	(0.6)	(0.8)
Amortization of net actuarial loss	0.3	0.1
Net periodic benefit costs	2.8	$ 2.4
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit costs	$ 0.8