Financing (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	9 Months Ended			9 Months Ended				1 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Dec. 31, 2013	Sep. 26, 2014 Liquid Yield Option Notes (LYONs)	Sep. 26, 2014	Sep. 26, 2014 Euro-denominated commercial paper	Sep. 26, 2014 Multi Year Facility	Jun. 27, 2014 Senior notes 2014 Notes	Sep. 26, 2014 Senior notes 2014 Notes
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 404,900,000	$ 966,900,000						$ 400,000,000
Interest rate of debt instrument									1.30%
Shares issued under debt conversion (shares)				1.3
Common stock, par value (dollars per share)	$ 0.01		$ 0.01
Deferred tax liability, basis difference in LYONs				15,000,000
Weighted average interest rate of short-term debt (interest rate)					0.10%
Weighted average maturity of commercial paper					13 days
Commercial paper	450,000,000		450,000,000			0
Line of credit							2,500,000,000
Borrowings outstanding under credit facility							$ 0