Pension Plans and Postretirement Benefits (Narrative) (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 27, 2015	Mar. 29, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Defined Benefit Plan Disclosure [Line Items]
Pension plan curtailment		$ 1,200,000
Contributions by employer by during period				$ 0	$ 0
Estimated contributions in current fiscal year				0
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net expense (income)	$ 1,000,000		$ (300,000)	1,900,000	(1,000,000)
Pension plan curtailment	$ 0		0	$ (1,200,000)	0
Pension Benefits - U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to determine the benefit obligation	4.50%			4.50%		5.40%
U.S. Government Cost Accounting Standards
Defined Benefit Plan Disclosure [Line Items]
Pension expense allocated to contracts pursuant to U.S. Government Cost Accounting Standards	$ 3,400,000		$ 3,400,000	$ 10,300,000	$ 10,300,000