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Investments in Real Estate Ventures (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) investment	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) investment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of separate property or fund co-investments | investment	47		47
Minimum ownership percentage in real estate ventures (in hundredths)	1.00%		1.00%
Maximum ownership percentage in real estate ventures (in hundredths)	10.00%		10.00%
Property, Plant and Equipment, Net, consolidated VIE	$ 583.3		$ 583.3		$ 567.9
Investments in real estate ventures	375.5		375.5		356.9
Total assets	10,580.9		10,580.9		10,025.5
Other Liabilities, Current	218.6		218.6		185.7
Total liabilities	6,697.1		6,697.1		6,291.0
Total liabilities and equity	10,580.9		10,580.9		10,025.5
Revenue, consolidated VIE	4,266.5	$ 3,903.7	8,087.1	$ 7,458.9
Net income	111.3	109.8	132.5	152.4
Fair Value [Abstract]
Fair value investments at beginning of the period			247.3	242.3
Investments in Real Estate Ventures, at Fair Value, Additions			32.2	11.1
Investments in Real Estate Ventures, at Fair Value, Distributions			22.3	29.0
Unrealized Gain (Loss) on Investments			14.6	13.6
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation			1.0	0.7
Fair value investments at end of the period	$ 272.8	238.7	$ 272.8	238.7
LaSalle Investment Company II [Member]
Schedule of Equity Method Investments [Line Items]
Partnership ownership interest (in hundredths)	48.78%		48.78%
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 60.4		$ 60.4
Exclusive of LaSalle Investment Company II [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	263.0		263.0
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Property, Plant and Equipment, Net, consolidated VIE	67.0		67.0		48.5
Investments in real estate ventures	13.3		13.3		14.0
Other Assets, consolidated VIE	7.1		7.1		4.4
Total assets	87.4		87.4		66.9
Other Liabilities, Current	1.3		1.3		0.9
Loans Payable, Fair Value Disclosure, consolidated VIE	38.6		38.6		28.2
Total liabilities	39.9		39.9		29.1
Members' Equity, consolidated VIE	47.5		47.5		37.8
Total liabilities and equity	87.4		87.4		$ 66.9
Revenue, consolidated VIE	1.7	1.7	3.0	2.7
Other Expenses, consolidated VIE	(1.6)	(1.6)	(3.2)	(2.4)
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE	0.0	0.5	0.0	2.0
Net income	$ 0.1	$ 0.6	$ (0.2)	$ 2.3

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

+ 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=109223946&loc=d3e3602-108585

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- Details

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