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Real estate (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Real Estate Properties [Line Items]    
Properties acquired $ 269.1 $ 502.5
Option to redeem interest at fair value period 7 years  
Residential Operating Properties
   
Real Estate Properties [Line Items]    
Properties acquired 172.4 61.8
Commercial Operating Properties
   
Real Estate Properties [Line Items]    
Properties acquired 63.4 258.8
Land
   
Real Estate Properties [Line Items]    
Properties acquired 33.3 181.9
Strategic Venture, Commercial Operating Properties
   
Real Estate Properties [Line Items]    
Properties acquired in joint venture 27.3  
Joint venture, venture contributions 11.6  
Joint venture, venture ownership percentage 40.00%  
Strategic Venture, Active Land Development Projects
   
Real Estate Properties [Line Items]    
Noncontrolling partner contribution 11.5  
Redeemable non-controlling interest $ 17.9