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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Loss Contingencies [Line Items]    
Operating lease rent expense $ 24.5 $ 25.3
Legal expenses 1.5  
Letters of credit 17.7  
Environmental Remediation [Member]    
Loss Contingencies [Line Items]    
Environmental remediation reserve 0.7 $ 1.6
Energy Contracts [Member]    
Loss Contingencies [Line Items]    
Energy commitments, 2017 4.9  
Energy commitments, 2018 $ 0.9