Commitments And Contingencies (Other Contingencies) (Details) $ in Millions		3 Months Ended
	Aug. 08, 2014 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2012 acre	Jul. 31, 2006
Loss Contingencies [Line Items]
Residual value guarantee liability			$ 7.8
Environmental Claims For Site In Goodyear Arizona [Member]
Loss Contingencies [Line Items]
Estimated liability				$ 49.4
Additional charge			49.0
Accrued environmental loss contingencies, current portion of total gross estimated liability					$ 16.2
Other receivables					$ 10.6
Loss contingency reimbursement rate							21.00%
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site [Member]
Loss Contingencies [Line Items]
Approximate size of referenced site, acres | acre						55,000
Environmental Claims For Site In Roseland New Jersey [Member]
Loss Contingencies [Line Items]
Additional charge			$ 6.8
Loss Contingency, Damages Paid, Value	$ 6.5	$ 6.5