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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Defined Benefit Plan, Contributions by Employer       $ 7,500,000  
Defined Benefit Plan, Lump Sum Benefits Paid       $ 49,100,000  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.40% 4.50%   4.40% 4.10%
Defined Benefit Plan, Expected Return on Plan Assets       $ 0.0675  
Scenario, Forecast [Member]          
Expected defined benefit plan contributions for next fiscal year for non-qualified plans     $ 1,000,000    
Cost of Sales [Member]          
Actuarial (gain) loss from remeasurement, net $ 21,600,000     $ 21,600,000  
Selling, General and Administrative Expenses [Member]          
Actuarial (gain) loss from remeasurement, net $ 3,200,000 $ 3,900,000