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Impairment Charges and Reserves - Impairment Charges on Assets or Investments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Impairment Charges And Impairment Of Joint Venture Investments [Abstract] |  |  |  |
Assets marketed for sale | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.6
(Adjustment) reserve of preferred equity interests | (3.5) | 6.4 | 19.4 | 12.1
Total impairment charges | (3.5) | 9.2 | 19.4 | 15.5
Undeveloped Land [Member] |  |  |  |
Impairment Charges And Impairment Of Joint Venture Investments [Abstract] |  |  |  |
Assets marketed for sale | $ 0.0 | $ 2.8 | $ 0.0 | $ 2.8

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- Definition Impairment charges and impairment of joint venture investments. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized into earnings included in continuing operations and discontinued operations and the equity method investment other than temporary impairment. + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Details
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