Pension And Other Post Retirement Benefits Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 29, 2014	Jun. 30, 2015	Jun. 29, 2014	Dec. 31, 2015
Other Post Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 300,000	$ 2,000,000	$ 400,000	$ 3,000,000
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 2,000,000		$ 4,000,000
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