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Retirement and Other Employee Benefits (Net Periodic Pension Cost of Defined Benefit Pension and Post-Retirement Benefit Plans) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 28, 2014
Mar. 29, 2013
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1.4 $ 1.4
Interest cost 1.8 1.6
Expected return on assets (1.1) (0.9)
Amortization of net actuarial loss 0.3 0.5
Net periodic benefit costs $ 2.4 $ 2.6