Commitments And Contingencies (Other Contingencies) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		3 Months Ended					3 Months Ended				3 Months Ended
	Mar. 31, 2012	Mar. 31, 2007	Dec. 31, 2011 Environmental Claims For A Site In Goodyear Arizona [Member]	Dec. 31, 2008 Environmental Claims For A Site In Goodyear Arizona [Member]	Mar. 31, 2012 Environmental Claims For A Site In Goodyear Arizona [Member]	Dec. 31, 2007 Environmental Claims For A Site In Goodyear Arizona [Member]	Jul. 31, 2006 Environmental Claims For A Site In Goodyear Arizona [Member]	Mar. 31, 2012 Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site [Member]	Mar. 31, 2012 Environmental Claims For Site In Roseland New Jersey [Member]	Apr. 15, 2011 Environmental Claims For Site In Roseland New Jersey [Member]	Jan. 08, 2010 Merrimac Securities Class Action Lawsuit [Member]	Mar. 31, 2012 Negligence Lawsuit Rising From Fire Damage [Member]
Loss Contingencies [Line Items]
Estimated liability				$ 65.2	$ 62.4	$ 41.5
Accrued environmental loss contingencies current					16.0
Amount of additional remediation activities			30.3	24.3
Other receivables					12.7
Stock price per share											$ 16.00
Estimate of lost profits, currently in excess												260
Approximate size of referenced site, acres								55,000
Number of separate lawsuits consolidated into one lawsuit												5
Approximate number of homes tested for contaminants									40
Number of homes where contaminants were found									3
Number of tenants who filed a separate lawsuit										1
Number of members in the purported class									142
Fair value of residual value guarantee	2.3	14.1
Loss contingency reimbursement rate							21.00%
Airplane operating lease period, years	7 years
Operating lease, fair value, commitment		$ 22.1