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Investments in Real Estate Ventures (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) investment | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) investment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 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% |  |
Summary of equity method investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | $ 567.9 |  |  |  | $ 543.9 |  |  |  | $ 567.9 | $ 543.9 |
Investments In Real Estate Ventures | 356.9 |  |  |  | 376.2 |  |  |  | 356.9 | 376.2 |
Total assets | 10,025.5 |  |  |  | 9,254.4 |  |  |  | 10,025.5 | 9,254.4 |
Other Liabilities, Current | 185.7 |  |  |  | 256.8 |  |  |  | 185.7 | 256.8 |
Mortgage indebtedness | 387.3 |  |  |  | 332.3 |  |  |  | 387.3 | 332.3 |
Total liabilities | 6,291.0 |  |  |  | 5,872.4 |  |  |  | 6,291.0 | 5,872.4 |
Total liabilities and equity | 10,025.5 |  |  |  | 9,254.4 |  |  |  | 10,025.5 | 9,254.4 |
Revenues | 4,889.7 | $ 3,969.8 | $ 3,903.7 | $ 3,555.2 | 4,343.0 | $ 3,522.2 | $ 3,470.3 | $ 3,117.7 | 16,318.4 | 14,453.2 | $ 12,991.2
Net income |  |  |  |  |  |  |  |  | 491.7 | 279.5 | 345.9
Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in real estate, net of depreciation | 13,217.7 |  |  |  | 17,407.4 |  |  |  | 13,217.7 | 17,407.4 |
Total assets | 15,561.2 |  |  |  | 19,589.7 |  |  |  | 15,561.2 | 19,589.7 |
Mortgage indebtedness | 4,968.0 |  |  |  | 6,170.5 |  |  |  | 4,968.0 | 6,170.5 |
Other borrowings | 561.7 |  |  |  | 926.3 |  |  |  | 561.7 | 926.3 |
Total liabilities | 6,155.8 |  |  |  | 8,301.1 |  |  |  | 6,155.8 | 8,301.1 |
Total equity | 9,405.4 |  |  |  | 11,288.6 |  |  |  | 9,405.4 | 11,288.6 |
Statements of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,199.5 | 1,319.0 | 1,266.8
Net income (loss) |  |  |  |  |  |  |  |  | 1,046.3 | 895.7 | 874.7
Fair Value [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fair value investments at beginning of the period |  |  |  | $ 242.3 |  |  |  | $ 212.7 | 242.3 | 212.7 | 155.2
Investments in Real Estate Ventures, at Fair Value, Additions |  |  |  |  |  |  |  |  | 55.2 | 33.5 | 105.8
Investments in Real Estate Ventures, at Fair Value, Distributions |  |  |  |  |  |  |  |  | 63.8 | 37.1 | 62.1
Net fair value gain |  |  |  |  |  |  |  |  | 13.9 | 28.1 | 16.6
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation |  |  |  |  |  |  |  |  | (0.3) | 5.1 | (2.8)
Fair value investments at end of the period | $ 247.3 |  |  |  | 242.3 |  |  |  | $ 247.3 | 242.3 | 212.7
LaSalle Investment Company II [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of equity method investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Our effective ownership interest in co-investment vehicle | 48.78% |  |  |  |  |  |  |  | 48.78% |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 60.4 |  |  |  |  |  |  |  | $ 60.4 |  |
LaSalle Investment Management [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of equity method investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 240.6 |  |  |  |  |  |  |  | 240.6 |  |
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of equity method investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 37.0 |  |  |  | 7.8 |  |  |  | 37.0 | 7.8 |
Consolidated Variable Interest Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of equity method investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | 48.5 |  |  |  | 15.7 |  |  |  | 48.5 | 15.7 |
Investments In Real Estate Ventures | 14.0 |  |  |  | 12.6 |  |  |  | 14.0 | 12.6 |
Other Assets | 4.4 |  |  |  | 44.4 |  |  |  | 4.4 | 44.4 |
Total assets | 66.9 |  |  |  | 72.7 |  |  |  | 66.9 | 72.7 |
Other Liabilities, Current | 0.9 |  |  |  | 30.9 |  |  |  | 0.9 | 30.9 |
Loans Payable, Fair Value Disclosure | 28.2 |  |  |  | 9.2 |  |  |  | 28.2 | 9.2 |
Total liabilities | 29.1 |  |  |  | 40.1 |  |  |  | 29.1 | 40.1 |
Members' Equity | 37.8 |  |  |  | 32.6 |  |  |  | 37.8 | 32.6 |
Total liabilities and equity | $ 66.9 |  |  |  | $ 72.7 |  |  |  | 66.9 | 72.7 |
Revenues |  |  |  |  |  |  |  |  | 5.8 | 5.9 | 6.6
Other Expenses |  |  |  |  |  |  |  |  | (5.1) | (4.2) | (7.1)
Gains on Sales of Investments |  |  |  |  |  |  |  |  | 2.0 | 0.0 | 13.3
Net income |  |  |  |  |  |  |  |  | $ 2.7 | $ 1.7 | $ 12.8

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