Financing (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	6 Months Ended			6 Months Ended				1 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Dec. 31, 2013	Jun. 27, 2014 Liquid Yield Option Notes (LYONs)	Jun. 27, 2014 Commercial Paper	Jun. 27, 2014 Euro-denominated commercial paper	Jun. 27, 2014 Multi Year Facility	Jun. 27, 2014 Senior notes 2014 Notes
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 403,600,000	$ 310,400,000						$ 400,000,000
Interest rate of debt instrument								1.30%
Shares issued under debt conversion (shares)				0.2
Common stock, par value (dollars per share)	$ 0.01		$ 0.01
Deferred tax liability, basis difference in LYONs				2,000,000
Weighted average interest rate of short-term debt (interest rate)					0.10%
Weighted average maturity of commercial paper					12 days
Commercial paper	450,000,000		450,000,000			0
Line of credit							2,500,000,000
Borrowings outstanding under credit facility							$ 0