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, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Amortization expense of intangible assets		$ 5.5	$ 10.5	$ 14.3		$ 18.4
Future Amortization Expense, 2017				13.6
Future Amortization Expense, 2018				12.9
Future Amortization Expense, 2019				12.2
Future Amortization Expense, 2020				11.4
Future Amortization Expense, 2021				$ 10.7
Needle Coke [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss					$ 35.4	$ 76.1
Percentage Decrease in Market Prices	18.00%
Fair Value Inputs, Discount Rate				10.50%