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Pension, Profit Sharing & Other Post-Retirement Benefits - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Defined Benefit Plan Disclosure [Line Items]        
Pension and profit sharing expense charged to operations $ 2.7 $ 2.1 $ 5.5 $ 4.3
Pension Plans, Defined Benefit [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Estimated future employer contributions in current fiscal year     7.0  
Contributions by employer     $ 2.9