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Defined Pension Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Apr. 02, 2017
Dec. 31, 2017
Qualified Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash contributions to defined benefit pension plan $ 0.4  
Minimum [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash contributions to defined benefit pension plan   $ 0.8
Maximum [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash contributions to defined benefit pension plan   $ 1.2