Commitments And Contingencies (Other Contingencies) (Details) $ in Millions		3 Months Ended		12 Months Ended
	Aug. 08, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2011 Home Homeowner	Dec. 31, 2015 USD ($)	Dec. 31, 2013 Homeowner	Dec. 31, 2012 acre	Apr. 15, 2011 Homeowner	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					$ 63.7
Additional charge		49.0
Accrued environmental loss contingencies, current portion of total gross estimated liability					16.0
Other receivables					$ 14.0
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
Approximate number of homes tested for contaminants | Home				40
Homeowners Filing Suits Against Company | Homeowner						139		3
Number of tenants who filed a separate lawsuit | Homeowner								1
Number of members in the purported class | Homeowner				138
Loss Contingency, Damages Paid, Value	$ 6.5		$ 6.5