Pension and Other Postretirement Benefit Plans (Schedule of Weighted-Average Assumptions Used) (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 (as a percent)	3.28%	4.34%
Rate of compensation increase (as a percent)	3.68%	3.73%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate (as a percent)	4.37%	3.69%	4.27%
Expected long-term return on plan assets (as a percent)	6.90%	6.90%	6.90%
Rate of compensation increase (as a percentage)	3.73%	3.73%	3.90%
Other Postretirement Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate (as a percent)	3.27%	4.34%
Rate of compensation increase (as a percent)	0.00%	0.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate (as a percent)	4.34%	3.65%	4.22%
Expected long-term return on plan assets (as a percent)	0.00%	0.00%	0.00%
Rate of compensation increase (as a percentage)	0.00%	0.00%	0.00%