Consolidated Investment Products (Level 3 Valuation Techniques) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Real Estate Investments, Net	$ 81.2	$ 76.2
Fair Value Inputs, Discount Rate	4.47%
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Real Estate Investments, Net	$ 81.2	$ 76.2
Discounted Cash Flow Valuation Technique [Member] \| Minimum [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	7.00%	7.00%
Fair Value Inputs, Cap Rate	4.25%	5.30%
Fair Value Inputs, Long-term Revenue Growth Rate	2.00%	2.00%
Discounted Cash Flow Valuation Technique [Member] \| Maximum [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	25.00%	33.00%
Fair Value Inputs, Cap Rate	4.25%	5.30%
Fair Value Inputs, Long-term Revenue Growth Rate	3.00%	3.00%
Discounted Cash Flow Valuation Technique [Member] \| Weighted Average [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	15.00%	17.00%
Fair Value Inputs, Cap Rate	4.25%	5.30%
Fair Value Inputs, Long-term Revenue Growth Rate	2.50%	2.50%

Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]

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- Definition

Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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- Definition

Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

+ References

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- Definition

Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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