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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. 29, 2013
Mar. 30, 2012
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1.4 $ 1.1
Interest cost 1.6 1.6
Expected return on assets (0.9) (0.9)
Amortization of net actuarial loss 0.5 0.3
Net periodic benefit costs $ 2.6 $ 2.1