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Investments in Real Estate Ventures (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) investment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 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% |  |
Line of credit facility, maximum borrowing capacity | $ 850.0 | $ 1,025.0 |
Summary of equity method investments [Abstract] |  |  |
Property and equipment, net | 543.9 | 501.0 |
Investments In Real Estate Ventures | 376.2 | 355.4 |
Total assets | 8,014.5 | 7,629.4 |
Mortgage indebtedness | 332.3 | 161.3 |
Total liabilities | 4,729.4 | 4,807.9 |
Total liabilities and equity | 8,014.5 | 7,629.4 |
Total segment revenue | 7,932.4 | 6,803.8 | $ 5,965.7
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 257.3 | 334.4 | 446.3
Balance Sheet [Abstract] |  |  |
Investments in real estate, net of depreciation | 17,407.4 | 14,780.7 |
Total assets | 19,589.7 | 16,728.2 |
Mortgage indebtedness | 6,170.5 | 5,480.6 |
Other borrowings | 926.3 | 502.0 |
Total liabilities | 8,301.1 | 6,729.7 |
Total equity | 11,288.6 | 9,998.5 |
Statements of Operations [Abstract] |  |  |
Revenue | 1,319.0 | 1,266.8 | 1,473.6
Net income (loss) | 895.7 | 874.7 | 1,179.5
Impairment [Abstract] |  |  |
Impairment charges | 1.2 | 1.7 | 6.0
Fair Value [Abstract] |  |  |
Fair value investments at beginning of the period | 212.7 | 155.2 | 113.6
Investments in Real Estate Ventures, at Fair Value, Additions | 33.5 | 105.8 | 33.8
Investments in Real Estate Ventures, at Fair Value, Distributions | 37.1 | 62.1 | 9.0
Net fair value gain | 28.1 | 16.6 | 21.1
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation | 5.1 | (2.8) | (4.3)
Fair value investments at end of the period | $ 242.3 | 212.7 | 155.2
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 | $ 216.5 |  |
LaSalle Investment Management [Member] |  |  |
Summary of equity method investments [Abstract] |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 65.4 |  |
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 | 7.8 | 7.3 |
Consolidated Variable Interest Entities [Member] |  |  |
Summary of equity method investments [Abstract] |  |  |
Property and equipment, net | 15.7 | 13.8 |
Investments In Real Estate Ventures | 12.6 | 10.3 |
Other Assets | 44.4 | 40.7 |
Total assets | 72.7 | 64.8 |
Mortgage indebtedness | 30.9 | 35.0 |
Loans Payable, Fair Value Disclosure | 9.2 | 9.7 |
Total liabilities | 40.1 | 44.7 |
Members' Equity | 32.6 | 20.1 |
Total liabilities and equity | 72.7 | 64.8 |
Total segment revenue | 5.9 | 6.6 | 8.5
Other Expenses | 4.2 | 7.1 | (3.9)
Gains on Sales of Investments | 0.0 | 13.3 | 1.4
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 1.7 | 12.8 | $ 6.0
Gain on Sales of Investment Real Estate, Proportionate Share, Equity Method |  | $ 3.3 |

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