Commitments And Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Loss Contingencies [Line Items]
Liabilities recognized for estimated environmental costs	$ 28.7		$ 28.7		$ 31.4
Estimated environmental liabilities, years			9 years
Environmental expenses	0.8	$ 2.9	$ 4.3	$ 4.3
Receivables from insurance carriers related to environmental matters	1.9		1.9		2.6
Accounts Receivable [Member]
Loss Contingencies [Line Items]
Receivables from insurance carriers related to environmental matters	0.8		0.8		0.7
Other Noncurrent Assets [Member]
Loss Contingencies [Line Items]
Receivables from insurance carriers related to environmental matters	$ 1.1		$ 1.1		$ 1.9