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Goodwill, Deferred Leasing Costs and Other Intangibles - Goodwill (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Goodwill [Roll Forward] |  |  |
Goodwill | $ 1,534,561,000 | $ 680,127,000 | $ 678,267,000
Business combinations | 0 | 1,440,229,000 | 1,860,000
Transfer to held for sale | 0 | (20,000,000) | 0
Disposition | 0 | (249,795,000) | 0
Impairment | 0 | (316,000,000) | 0
Goodwill | 1,534,561,000 | 1,534,561,000 | 680,127,000
Industrial |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 20,000,000 |  |
Impairment | 0 | 0 |
Goodwill | 20,000,000 | 20,000,000 |
Investment management |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill | 1,514,561,000 |  |
Impairment | 0 | 0 | $ 0
Goodwill | $ 1,514,561,000 | $ 1,514,561,000 |
Minimum |  |  |
Goodwill [Roll Forward] |  |  |
Terminal year residual multiples |  | 6.5 |
Incentive fee multiples |  | 3 |
Discount rate percentage |  | 9.00% |
Maximum |  |  |
Goodwill [Roll Forward] |  |  |
Terminal year residual multiples |  | 20 |
Incentive fee multiples |  | 5 |
Discount rate percentage |  | 25.00% |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: 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=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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- Definition The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99384497&loc=d3e14881-158438 + Details
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