Derivative Financial Instruments (Narrative) (Details) - Foreign currency forward contracts $ in Millions	3 Months Ended
	Apr. 01, 2018 USD ($) derivative_instrument
Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Approximate number of derivatives per quarter | derivative_instrument	10
Average size of derivative contracts | $	$ 2.0
Cash Flow Hedges
Derivative [Line Items]
Approximate number of derivatives per quarter | derivative_instrument	10
Average size of derivative contracts | $	$ 7.0
Estimated term of reclassification from OCI to Income	12 months
Maximum number of days after hedge period allowed before de-designation	60 days
Minimum | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Term of derivative contracts	1 month
Maximum
Derivative [Line Items]
Term of derivative contracts	11 months
Maximum | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Term of derivative contracts	3 months
Maximum | Cash Flow Hedges
Derivative [Line Items]
Term of derivative contracts	11 months