Pension And Other Post Retirement Benefits Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 28, 2014	Sep. 30, 2015	Sep. 28, 2014	Dec. 31, 2015
Other Post Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 500,000	$ 400,000	$ 900,000	$ 3,000,000
Defined Benefit Plan, Plan Amendments	$ 3,000,000
Amortization Period of Plan Amendment	10 years
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 7,000,000		$ 11,000,000
Scenario, Forecast | Other Post Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer					$ 1,000,000
Scenario, Forecast | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer					$ 0