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Employee Benefit Obligations (Details 6) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Plans      
Employer match of deferred compensation (as a percent) 20.00%    
Employer contribution limit per calendar year $ 20,000    
Number of shares, value equivalent, for each stock unit 1    
Other Benefit Plans      
Percentage of eligible compensation, matched 100% by employer 3.00%    
Percentage of eligible compensation, matched 50% by employer 2.00%    
Employer match of employee contributions of first 3% of eligible compensation (as a percent) 100.00%    
Employer match of employee contributions of next 2% of eligible compensation (as a percent) 50.00%    
Expense associated with the company match $ 23,600,000 $ 23,600,000 $ 23,500,000
Aerospace & technologies      
Employee Benefit Obligations      
Performance-based matching cash contributions by employer limit (as a percent of base salary) 4.00%    
Additional compensation expense related to performance-based program recognized $ 0 $ 4,700,000 $ 0
Other post retirement benefits      
Employee Benefit Obligations      
Increase in the total of service and interest cost due to one-percentage point increase in assumed health care cost trend rate 200,000    
Decrease in the total of service and interest cost due to one-percentage point decrease in assumed health care cost trend rate (200,000)    
Increase in the postretirement benefit obligation due to one-percentage point increase in assumed health care cost trend rate 2,900,000    
Decrease in the postretirement benefit obligation due to one-percentage point decrease in assumed health care cost trend rate $ (2,800,000)    
U.S. health care plans      
Employee Benefit Obligations      
Health care cost trend rate used for pre-65 and post-65 benefits (as a percent) 7.50%    
Rate to which the health care cost trend rate is assumed to decline (as a percent) 5.00%    
Canadian plans      
Employee Benefit Obligations      
Health care cost trend rate used for pre-65 and post-65 benefits (as a percent) 4.50%    
Rate to which the health care cost trend rate is assumed to decline (as a percent) 5.00%