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. 30, 2018	Mar. 31, 2017
Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.5	$ 1.4
Interest cost	1.6	1.6
Expected return on assets	(0.9)	(0.8)
Amortization of net actuarial loss	0.2	0.3
Net periodic benefit costs	2.4	2.5
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit costs	0.7	0.5
Other Expense | Accounting Standards Update 2017-07
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit costs	$ 0.9	$ 1.1