Retirement and Other Employee Benefits - Net Periodic Pension Cost of Defined Benefit Pension and Post-Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.4	$ 1.5
Interest cost	1.7	1.6
Expected return on assets	(0.8)	(0.9)
Amortization of net actuarial loss	0.1	0.2
Net periodic benefit costs	2.4	2.4
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit costs	$ 0.8	$ 0.7