Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015	Aug. 14, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Amortization expense of intangible assets		$ 6.2	$ 10.8		$ 19.0	$ 20.5
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year		16.2		$ 16.2
Future Amortization Expense, 2014		15.4		15.4
Future Amortization Expense, 2015		14.6		14.6
Future Amortization Expense, 2016		13.8		13.8
Future Amortization Expense, 2017		$ 12.9		12.9
Needle Coke [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss				$ 35.4	$ 75.7
Fair Value Inputs, Discount Rate				10.50%
Percentage Decrease in Market Prices	18.00%
Fair Value Assumptions, Period of Forecasted Cash Flows				17 years