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Pension and Post-retirement and Other Benefit Plans - Target and Actual Asset Allocations (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Target 100.00%  
Weighted average asset allocations 100.00% 100.00%
Equity    
Defined Benefit Plan Disclosure [Line Items]    
Target - minimum 30.00%  
Target - maximum 70.00%  
Weighted average asset allocations 48.00% 48.00%
Fixed income    
Defined Benefit Plan Disclosure [Line Items]    
Target - minimum 20.00%  
Target - maximum 40.00%  
Weighted average asset allocations 31.00% 24.00%
Real estate and other    
Defined Benefit Plan Disclosure [Line Items]    
Target - minimum 10.00%  
Target - maximum 30.00%  
Weighted average asset allocations 20.00% 27.00%
Cash    
Defined Benefit Plan Disclosure [Line Items]    
Target - minimum 0.00%  
Target - maximum 10.00%  
Weighted average asset allocations 1.00% 1.00%