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Investments in Real Estate Ventures (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) investment	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) investment	Sep. 30, 2018 USD ($)	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	$ 671.0		$ 671.0		$ 567.9
Investments in real estate ventures	412.4		412.4		356.9
Total assets	13,077.9		13,077.9		10,025.5
Other Liabilities, Current	240.5		240.5		185.7
Total liabilities	8,211.3		8,211.3		6,291.0
Total liabilities and equity	13,077.9		13,077.9		10,025.5
Revenue, consolidated VIE	4,495.6	$ 3,969.8	12,582.7	$ 11,428.7
Net income	129.3	136.1	261.8	288.5
Fair Value [Abstract]
Fair value investments at beginning of the period			247.3	242.3
Investments in Real Estate Ventures, at Fair Value, Additions			67.1	27.7
Investments in Real Estate Ventures, at Fair Value, Distributions			39.2	31.0
Unrealized Gain (Loss) on Investments			29.8	8.2
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation			(0.8)	(1.2)
Fair value investments at end of the period	$ 304.2	246.0	$ 304.2	246.0
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	267.0		267.0
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Property, Plant and Equipment, Net, consolidated VIE	115.1		115.1		48.5
Investments in real estate ventures	13.1		13.1		14.0
Other Assets, consolidated VIE	14.8		14.8		4.4
Total assets	143.0		143.0		66.9
Other Liabilities, Current	2.3		2.3		0.9
Loans Payable, Fair Value Disclosure, consolidated VIE	73.0		73.0		28.2
Total liabilities	75.3		75.3		29.1
Members' Equity, consolidated VIE	67.7		67.7		37.8
Total liabilities and equity	143.0		143.0		$ 66.9
Revenue, consolidated VIE	1.9	1.6	4.9	4.3
Other Expenses, consolidated VIE	(2.1)	(1.4)	(5.3)	(3.8)
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE	0.0	0.0	0.0	2.0
Net income	$ (0.2)	$ 0.2	$ (0.4)	$ 2.5

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