Pension and Other Post-Retirement Benefits (Weighted Average Assumptions) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rates (as a percent)	3.70%	4.40%
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rates (as a percent)	3.55%	4.10%
Health care cost trend rate - initial (as a percent)	6.75%	7.25%
Health care cost trend rate - ultimate (as a percent)	5.00%	5.00%	5.00%
Year ultimate reached	2022	2022	2022