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Real Estate (Acquisitions) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Corporate Joint Venture
Sep. 30, 2013
Land
Sep. 30, 2012
Residential Operating Properties
Sep. 30, 2012
Commercial Operating Properties
Sep. 30, 2012
Land
Real Estate Properties [Line Items]            
iStar's ownership percentage, consolidated   63.00%        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   37.00%        
Fair value of assets acquired $ 212.0 $ 25.5 $ 5.2 $ 172.4 $ 15.6 $ 24.0