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Commitments And Contingencies (Other Contingencies Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 6 Months Ended
Mar. 31, 2007
Dec. 31, 2008
Environmental Claims For A Site In Goodyear Arizona [Member]
Jun. 30, 2011
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]
Jun. 30, 2011
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site [Member]
Jun. 30, 2011
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]
Jun. 30, 2011
Negligence Lawsuit Rising From Fire Damage [Member]
Estimated liability   $ 65.2 $ 33.1 $ 41.5            
Charge   24.3                
Accrued Environmental Loss Contingencies Current     12.8              
Other Receivables     7.7              
Stock price per share                 $ 16.00  
Estimate of lost profits                   260
Approximate size of referenced site           55,000        
Number of separate lawsuit 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      
Residual value guarantee $ 14.1                  
Loss contingency reimbursement rate         21.00%