Commitments And Contingencies (Narrative) (Details) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 13, 2013 company	Mar. 31, 2015 entity party	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Loss Contingencies [Line Items]
Number of entities contributing little or no impact to lower passaic river | entity		10
Companies | company	71
Number of potentially responsible parties | party		10
Accrued probable future environmental expenditures			$ 125.9	$ 119.9	$ 121.1	$ 125.9	$ 75.4
Environmental costs				$ 3.5	$ 3.7	$ 23.5
Remedial Investigation And Feasibility Study (RIFS) | Calvert City
Loss Contingencies [Line Items]
Remediation charge			$ 47.0