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Pension and Other Postretirement Benefits - Weighted-Average Assumptions Used to Determine Benefit Obligations (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 2.98% 3.94%  
Rate of compensation increase 2.05% 2.34%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 3.78% 3.65% 4.18%
Expected long-term return on plan assets 5.91% 5.78% 6.31%
Rate of compensation increase 2.33% 2.44% 2.49%
Postretirement Benefits Other than Pensions      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 2.68% 3.84%  
Rate of compensation increase 0.00% 0.00%  
Initial healthcare cost trend rate 6.10% 6.80%  
Ultimate healthcare cost trend rate 4.50% 4.50% 4.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 3.84% 3.42% 3.89%
Expected long-term return on plan assets 0.00% 0.00% 0.00%
Rate of compensation increase 2.50% 2.50% 0.00%
Initial healthcare cost trend rate 6.50% 6.80% 7.00%
Ultimate healthcare cost trend rate 4.50% 4.50% 4.50%