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Real estate (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property sold, aggregate, carrying value     $ 180,600,000
Repayment of principal amount   97,200,000  
Net proceeds from sales of real estate assets 562,705,000 215,930,000 1,823,181,000
Gain (loss) on sale of leased assets, net operating leases included in income from discontinued operations   22,200,000  
Mezzanine loans provided to purchaser of net lease assets   105,600,000  
Property subject to or available for operating lease sold in addition to previous sales aggregate carrying value     119,700,000
Gain (loss) on additional sale of leased assets net operating leases     20,100,000
Net Lease Assets
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property sold, aggregate, carrying value 9,800,000 34,100,000  
Net gain on sale of net lease assets 2,400,000 3,200,000  
Commercial Operating Properties
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property sold, aggregate, carrying value 29,300,000 17,900,000  
Land
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property sold, aggregate, carrying value 72,100,000 9,500,000 3,100,000
Portfolio Lease Asset Sale | Net Lease Assets
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of net lease assets sold 12   32
Property sold, aggregate, carrying value 105,700,000   1,050,000,000
Net gain on sale of net lease assets 24,900,000   250,300,000
Repayment of principal amount 50,800,000    
Net proceeds from sales of real estate assets     $ 1,350,000,000