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		6 Months Ended
	Jun. 26, 2015	Jun. 27, 2014	Jun. 26, 2015	Jun. 27, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.5	$ 1.4	$ 2.9	$ 2.7
Interest cost	1.6	1.8	3.3	3.6
Expected return on assets	(0.9)	(1.1)	(1.9)	(2.3)
Amortization of net actuarial loss	0.4	0.3	0.8	0.6
Net periodic benefit costs	$ 2.6	$ 2.4	$ 5.1	$ 4.6