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Investments in Real Estate Ventures (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) investment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Number of separate property or fund co-investments | investment | 50 |  |
Minimum ownership percentage in real estate ventures (in hundredths) | 1.00% |  |
Maximum ownership percentage in real estate ventures (in hundredths) | 10.00% |  |
Summary of equity method investments [Abstract] |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | $ 76.4 | $ 65.5 |
Property and equipment, net | 663.9 | 701.9 |
Investments In Real Estate Ventures | 430.8 | 404.2 |
Total assets | 14,316.5 | 13,672.6 |
Other Liabilities, Current | 299.6 | 203.2 |
Mortgage indebtedness | 597.5 | 436.2 |
Total liabilities | 8,698.7 | 8,459.3 |
Total liabilities and equity | 14,316.5 | 13,672.6 |
Revenues | 16,589.9 | 17,983.2 | $ 16,318.4
Net income | 422.7 | 537.9 | 491.7
Balance Sheet [Abstract] |  |  |
Equity Method Investment, Summarized Financial Information,Noncurrent Assets | 24,320.4 | 22,006.6 |
Equity Method Investment, Summarized Financial Information,Assets | 28,129.3 | 24,784.8 |
Mortgage indebtedness | 7,980.2 | 7,345.1 |
Other borrowings | 1,332.9 | 1,118.2 |
Total Liabilities | 10,720.5 | 9,853.9 |
Total equity | 17,408.8 | 14,930.9 |
Statements of Operations [Abstract] |  |  |
Revenue | 1,702.3 | 1,247.6 | 1,199.5
Net Income (Loss) | 241.5 | 831.2 | 1,046.3
Fair Value [Abstract] |  |  |
Fair value investments at beginning of the period | 328.6 | 247.3 | 242.3
Investments in Real Estate Ventures, at Fair Value, Additions | 51.7 | 144.9 | 55.2
Investments in Real Estate Ventures, at Fair Value, Distributions | (46.8) | (101.7) | (63.8)
Net fair value gain | (1.0) | 35.3 | 13.9
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation | 7.8 | 2.8 | (0.3)
Fair value investments at end of the period | $ 340.3 | 328.6 | 247.3
LaSalle Investment Company II [Member] |  |  |
Summary of equity method investments [Abstract] |  |  |
Our effective ownership interest in co-investment vehicle | 48.78% |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 60.4 |  |
LaSalle Investment Management [Member] |  |  |
Summary of equity method investments [Abstract] |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 320.7 |  |
Consolidated Variable Interest Entities [Member] |  |  |
Summary of equity method investments [Abstract] |  |  |
Property and equipment, net | 117.4 | 126.3 |
Investments In Real Estate Ventures | 9.0 | 13.2 |
Other Assets | 21.0 | 14.3 |
Total assets | 147.4 | 153.8 |
Other Liabilities, Current | 1.9 | 3.2 |
Loans Payable, Fair Value Disclosure | 60.3 | 69.7 |
Total liabilities | 62.2 | 72.9 |
Members' Equity | 85.2 | 80.9 |
Total liabilities and equity | 147.4 | 153.8 |
Revenues | 13.9 | 7.6 | 5.8
Other Expenses | (15.6) | (8.6) | (5.1)
Gains on Sales of Investments | 22.1 | 0.0 | 2.0
Net income | $ 20.4 | $ (1.0) | $ 2.7

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