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Real estate (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 | Jun. 30, 2013 Net Lease Assets property | Jun. 30, 2012 Net Lease Assets property | Jun. 30, 2013 Commercial Operating Properties property | Jun. 30, 2012 Commercial Operating Properties property | Jun. 30, 2013 Land | Jun. 30, 2012 Land | Apr. 30, 2012 Portfolio Lease Asset Sale Net Lease Assets property | Jun. 30, 2013 Real estate equity investments Land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Property sold, aggregate, carrying value |  |  |  |  | $ 43.2 | $ 10.3 | $ 5.5 | $ 2.7 |  | $ 21.4
Gain (Loss) on disposition of property, sale carve out |  |  |  |  | 9.9 |  |  |  |  | 3.4
iStar's ownership percentage, equity method |  |  |  |  |  |  |  |  |  | 47.50%
Number of real estate properties sold |  |  | 3 | 2 | 3 | 5 |  |  | 12 |
Net lease assets sold, carrying value |  |  | 13.5 | 9.8 |  |  |  |  | 105.7 |
Gain (loss) on sale of leased assets, net, operating leases, sale carve out |  |  | 3.4 | 2.4 |  |  |  |  | 24.9 |
Impairment of long-lived assets sale carve out | $ 1.3 | $ 16.6 |  |  |  | $ (1.4) |  |  |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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