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Compensation and Benefit Plans (Weighted Average Assumptions) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Postretirement Benefits Other Than Pensions      
Assumed health care cost trend rates:      
Ultimate rate 5.00% 5.00%  
Pension Plans      
Pension and Other Postretirement Benefits      
Discount rate 4.18% 3.85% 4.50%
Rate of compensation increase 4.00% 4.00% 4.00%
Expected long-term return on plan assets 7.00% 7.00% 7.00%
Continuing Operations | Postretirement Benefits Other Than Pensions      
Pension and Other Postretirement Benefits      
Discount rate 4.55% 4.16% 5.00%
Expected long-term return on plan assets 5.60% 5.50% 5.50%
Assumed health care cost trend rates:      
Current year 7.50% 7.75% 7.75%
Ultimate rate 5.00% 5.00% 5.00%