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Pension Plans and Post Retirement Benefits (Pension Plans with Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets) (Details) - USD ($)
$ in Millions
Jan. 01, 2017
Jan. 03, 2016
Compensation and Retirement Disclosure [Abstract]    
Projected benefit obligation $ 93.7 $ 97.6
Accumulated benefit obligation 91.4 94.7
Fair value of plan assets $ 42.1 $ 43.8