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Investments in Real Estate Ventures (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) investment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of separate property or fund co-investments | investment	44
Minimum ownership percentage in real estate ventures (in hundredths)	1.00%
Maximum ownership percentage in real estate ventures (in hundredths)	10.00%
Property, Plant and Equipment, Net, consolidated VIE	$ 578.5		$ 567.9
Investments in real estate ventures	361.9		356.9
Total assets	10,552.5		10,025.5
Other Liabilities, Current	213.0		185.7
Total liabilities	6,749.0		6,291.0
Total liabilities and equity	10,552.5		$ 10,025.5
Revenue, consolidated VIE	3,820.6	$ 3,555.2
Net income	21.2	42.6
Fair Value [Abstract]
Fair value investments at beginning of the period	247.3	242.3
Investments in Real Estate Ventures, at Fair Value, Additions	10.5	2.6
Investments in Real Estate Ventures, at Fair Value, Distributions	2.8	22.5
Unrealized Gain (Loss) on Investments	4.3	5.8
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation	0.3	5.3
Fair value investments at end of the period	$ 259.6	233.5
LaSalle Investment Company II [Member]
Schedule of Equity Method Investments [Line Items]
Partnership ownership interest (in hundredths)	48.78%
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 60.4
Exclusive of LaSalle Investment Company II [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	245.6
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Property, Plant and Equipment, Net, consolidated VIE	63.7	48.5
Investments in real estate ventures	13.0	14.0
Other Assets, consolidated VIE	7.4	4.4
Total assets	84.1	66.9
Other Liabilities, Current	1.5	0.9
Loans Payable, Fair Value Disclosure, consolidated VIE	35.3	28.2
Total liabilities	36.8	29.1
Members' Equity, consolidated VIE	47.3	37.8
Total liabilities and equity	84.1	66.9
Revenue, consolidated VIE	1.3	1.0
Other Expenses, consolidated VIE	(1.6)	(0.8)
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE	0.0	1.5
Net income	$ (0.3)	$ 1.7

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-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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