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Investments in Real Estate Ventures (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) investment	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) investment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of separate property or fund co-investments | investment	45		45
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	$ 540.8		$ 540.8		$ 543.9
Investments in real estate ventures	371.5		371.5		376.2
Total assets	9,619.1		9,619.1		9,254.4
Other Liabilities, Current	195.2		195.2		256.8
Total liabilities	6,046.3		6,046.3		5,872.4
Total liabilities and equity	9,619.1		9,619.1		9,254.4
Revenue, consolidated VIE	3,969.8	$ 3,522.2	11,428.7	$ 10,110.2
Net income	136.1	99.2	288.5	201.8
Fair Value [Abstract]
Fair value investments at beginning of the period			242.3	212.7
Investments in Real Estate Ventures, at Fair Value, Additions			27.7	21.2
Investments in Real Estate Ventures, at Fair Value, Distributions			31.0	22.5
Unrealized Gain (Loss) on Investments			8.2	17.9
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation			(1.2)	4.9
Fair value investments at end of the period	$ 246.0	234.2	$ 246.0	234.2
LaSalle Investment Company II [Member]
Schedule of Equity Method Investments [Line Items]
Partnership ownership interest (in hundredths)	49.00%		49.00%
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	212.5		212.5
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Property, Plant and Equipment, Net, consolidated VIE	36.6		36.6		15.7
Investments in real estate ventures	13.9		13.9		12.6
Other Assets, consolidated VIE	11.1		11.1		44.4
Total assets	61.6		61.6		72.7
Other Liabilities, Current	1.0		1.0		30.9
Loans Payable, Fair Value Disclosure, consolidated VIE	26.0		26.0		9.2
Total liabilities	27.0		27.0		40.1
Members' Equity, consolidated VIE	34.6		34.6		32.6
Total liabilities and equity	61.6		61.6		$ 72.7
Revenue, consolidated VIE	1.6	1.8	4.3	4.4
Other Expenses, consolidated VIE	(1.4)	(1.6)	(3.8)	(3.6)
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE	0.0	0.0	2.0	0.0
Net income	$ 0.2	$ 0.2	$ 2.5	$ 0.8

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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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