Benefit Plans (Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Weighted average assumptions used in net periodic benefit cost:
Discount rate	4.50%	3.99%	4.78%
Rate of compensation increase	4.29%	4.24%	4.29%
Long-term rate of return on assets	7.01%	7.12%	7.37%
Weighted average assumptions used in benefit obligations:
Discount rate	3.96%	4.82%
Rate of compensation increase	4.14%	4.37%
Other Retirement Benefits [Member]
Weighted average assumptions used in net periodic benefit cost:
Discount rate	4.55%	3.50%	4.50%
Weighted average assumptions used in benefit obligations:
Discount rate	3.90%	4.55%