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Note 8 - Investment and Advances in Real Estate Joint Ventures (Detail) - Investment and Advances to Real Estate Joint Ventures - Balance Sheets (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets:    
Assets $ 9,031.0 $ 9,767.8
Liabilities and Partners’/Members’ Capital:    
Noncontrolling interests 19.1 25.4
Partners’/Members’ capital 3,593.8 3,662.0
9,031.0 9,767.8
Real Estate [Member]
   
Assets:    
Assets 8,523.3 9,158.5
Other Assets [Member]
   
Assets:    
Assets 507.7 609.3
Notes Payable [Member]
   
Liabilities and Partners’/Members’ Capital:    
Liabilities 148.0 150.5
Mortgage Payable [Member]
   
Liabilities and Partners’/Members’ Capital:    
Liabilities 5,056.5 5,604.3
Construction Loans [Member]
   
Liabilities and Partners’/Members’ Capital:    
Liabilities 25.1 109.4
Other Liabilities [Member]
   
Liabilities and Partners’/Members’ Capital:    
Liabilities $ 188.5 $ 216.2