Benefit Plans (Actuarial Assumptions for Net Cost or Benefit) (Details)	6 Months Ended				12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	3.85%				4.65%	3.80%
Expected long term rate of return					7.50%	7.50%	7.75%
Rate of compensation increases					3.92%	3.99%	4.066%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			3.10%	3.60%	2.50%		2.80%