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		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 1.4	$ 1.4	$ 4.3	$ 4.1
Interest cost	1.7	1.7	5.0	5.3
Expected return on assets	(1.0)	(1.1)	(2.9)	(3.4)
Amortization of net actuarial loss	0.4	0.3	1.2	0.9
Net periodic benefit costs	$ 2.5	$ 2.3	$ 7.6	$ 6.9