Commitments And Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Loss Contingencies [Line Items]
Liabilities recognized for estimated environmental costs	$ 25.8		$ 25.8		$ 31.4
Estimated environmental liabilities, years			9 years
Environmental expenses	0.3	$ 1.3	$ 4.6	$ 5.6
Receivables from insurance carriers related to environmental matters	2.0		2.0		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	$ 1.2		$ 1.2		$ 1.9