Derivative Instruments and Hedging Activities (Company's Derivative Positions and Their Impact on Financial Position) (Details) - Significant Other Observable Inputs (Level 2) - Designated as Hedging Instrument [Member] - Foreign exchange contracts - USD ($) $ in Millions	Sep. 26, 2015	Dec. 27, 2014
Non-trade amounts receivable
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 34.7	$ 35.0
Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 18.9	$ 30.3