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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 |

X
- Definition Represents an increase in noncontrolling interest from noncash asset contribution(s) by the noncontrolling interest partner. + References No definition available. + Details
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- Definition Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Other Owner Contribution, Fair Value + References No definition available. + Details
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- Definition Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Redeemable Value + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Real Estate, Net + References No definition available. + Details
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- Definition Noncontrolling Interest, Option to Redeem Interest at Fair Value Period + References No definition available. + Details
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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph p(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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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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- Details
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