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Real Estate Activities (Dispositions of Assets for Discontinued Operations)(Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2013
Feb. 28, 2013
Jan. 31, 2013
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Disposals [Line Items]                    
Impairment losses       $ 54.0 $ 51.4 $ 28.7 $ 6.2 $ 2.3 $ 16.1 $ 1.3
Paxton Towne Centre [Member]                    
Disposals [Line Items]                    
Goodwill, Written off Related to Sale of Business Unit     $ 0.7              
Christiana Center [Member]                    
Disposals [Line Items]                    
Goodwill, Written off Related to Sale of Business Unit     0.8              
Mortgage loans assumed by buyer $ 49.2                  
Power Center [Member] | Mortgage Loans on Real Estate [Member]                    
Disposals [Line Items]                    
Proceeds from the sale of property to repay                   $ 50.0
2010 Credit Facility [Member] | Mall [Member]                    
Disposals [Line Items]                    
Proceeds from the sale of property to repay   $ 35.0 11.5              
Available working capital pay for release     $ 4.5              
2013 Revolving Credit Facility [Member]                    
Disposals [Line Items]                    
Repay borrowings under revolving facility $ 35.0