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Benefit Plans, Weighted Average Assumptions Used (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted average assumptions used to determine net periodic benefit cost [Abstract]      
Discount rate 3.16% 3.56% 3.88%
Expected return on plan assets 6.40% 6.61% 6.89%
Rate of compensation increase 3.01% 3.01% 3.03%
Weighted average assumptions used to determine benefit obligation [Abstract]      
Discount rate 3.75% 3.16% 3.60%
Rate of compensation increase 3.01% 3.01% 2.96%
Actual return (loss) on pension assets (5.00%) 11.00% 8.00%
Maximum health care cost trend rate 5.00%