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Goodwill, Deferred Leasing Costs and Other Intangibles - Goodwill (Details)	12 Months Ended
	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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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.

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The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders.

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