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Postretirement Benefit Plans - Weighted Average Allocations (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
U.S. defined benefit plan | Fixed income securities and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Targeted allocation (in percent) 65.00%  
Actual plan asset allocation (in percent) 66.00% 65.00%
U.S. defined benefit plan | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Targeted allocation (in percent) 35.00%  
Actual plan asset allocation (in percent) 34.00% 35.00%
U.S. retiree health care plan | Fixed income securities and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Targeted allocation range minimum (in percent) 50.00%  
Targeted allocation range maximum (in percent) 65.00%  
Actual plan asset allocation (in percent) 52.00% 50.00%
U.S. retiree health care plan | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Targeted allocation range minimum (in percent) 35.00%  
Targeted allocation range maximum (in percent) 50.00%  
Actual plan asset allocation (in percent) 48.00% 50.00%
Non-U.S. defined benefit plan | Fixed income securities and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Targeted allocation range minimum (in percent) 60.00%  
Targeted allocation range maximum (in percent) 100.00%  
Actual plan asset allocation (in percent) 72.00% 70.00%
Non-U.S. defined benefit plan | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Targeted allocation range minimum (in percent) 0.00%  
Targeted allocation range maximum (in percent) 40.00%  
Actual plan asset allocation (in percent) 28.00% 30.00%