Commitments And Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Loss Contingencies [Line Items]
Liabilities recognized for estimated environmental costs	$ 32.4		$ 31.4
Estimated environmental liabilities, years	9 years
Environmental expenses	$ 3.5	$ 1.4
Receivables from insurance carriers related to environmental matters	2.1		2.6
Accounts Receivable [Member]
Loss Contingencies [Line Items]
Receivables from insurance carriers related to environmental matters	0.8		0.7
Other Noncurrent Assets [Member]
Loss Contingencies [Line Items]
Receivables from insurance carriers related to environmental matters	$ 1.3		$ 1.9