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Investments in Real Estate Ventures (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) investment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Number of separate property or fund co-investments | investment | 52 |  |
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 | $ 1,025,000,000 | $ 650,000,000 |
Summary of equity method investments [Abstract] |  |  |
Property and equipment, net | 501,000,000 | 423,300,000 |
Investments In Real Estate Ventures | 355,400,000 | 311,500,000 |
Total assets | 7,629,400,000 | 6,187,100,000 |
Mortgage indebtedness | 367,100,000 | 208,500,000 |
Total liabilities | 4,807,900,000 | 3,457,700,000 |
Total liabilities and equity | 7,629,400,000 | 6,187,100,000 |
Total segment revenue | 6,803,800,000 | 5,965,700,000 | $ 5,429,600,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 334,400,000 | 446,300,000 | 388,000,000
Balance Sheet [Abstract] |  |  |
Investments in real estate, net of depreciation | 14,780,700 | 12,216,700 |
Total assets | 16,728,200 | 13,993,900 |
Mortgage indebtedness | 5,480,600 | 4,345,900 |
Other borrowings | 502,000 | 628,200 |
Total liabilities | 6,729,700 | 5,608,300 |
Total equity | 9,998,500 | 8,385,600 |
Statements of Operations [Abstract] |  |  |
Revenue | 1,266,800 | 1,473,600 | 1,397,600
Net income (loss) | 874,700 | 1,179,500 | 1,099,100
Impairment [Abstract] |  |  |
Impairment charges | 1,700,000 | 6,000,000 | 2,400,000
Fair Value [Abstract] |  |  |
Fair value investments at beginning of the period | 155,200,000 | 113,600,000 | 78,900,000
Investments | 105,800,000 | 33,800,000 | 35,200,000
Distributions | (62,100,000) | (9,000,000) | (3,100,000)
Net fair value gain | 16,600,000 | 21,100,000 | 7,100,000
Foreign currency translation adjustments, net | (2,800,000) | (4,300,000) | (4,500,000)
Fair value investments at end of the period | 212,700,000 | 155,200,000 | 113,600,000
LaSalle Investment Company II [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Unfunded capital commitments to the underlying funds for future funding of co-investments | 61,500,000 |  |
Line of credit facility, maximum borrowing capacity | $ 10,000,000 |  |
Summary of equity method investments [Abstract] |  |  |
Our effective ownership interest in co-investment vehicle | 48.78% |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 68,800,000 |  |
Entity share of Unfunded Capital Commitments for Future Fundings | 30,000,000 |  |
Our share of exposure on outstanding borrowings | 700,000 |  |
Loss Contingency, Estimate of Possible Loss | 4,900,000 |  |
Exclusive of LaSalle Investment Company II [Member] |  |  |
Summary of equity method investments [Abstract] |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 139,800,000 |  |
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 | 7,300,000 | 2,100,000 |
Consolidated Variable Interest Entities [Member] |  |  |
Summary of equity method investments [Abstract] |  |  |
Property and equipment, net | 13,800,000 | 32,600,000 |
Investments In Real Estate Ventures | 10,300,000 | 6,600,000 |
Other Assets | 40,700,000 | 4,900,000 |
Total assets | 64,800,000 | 44,100,000 |
Mortgage indebtedness | 9,700,000 | 25,800,000 |
Other liabilities | 35,000,000 | 0 |
Total liabilities | 44,700,000 | 25,800,000 |
Members' Equity | 20,100,000 | 18,300,000 |
Total liabilities and equity | 64,800,000 | 44,100,000 |
Total segment revenue | 6,600,000 | 8,500,000 | 4,200,000
Other Expenses | (7,100,000) | (3,900,000) | (3,900,000)
Gains on Sales of Investments | 13,300,000 | 1,400,000 | 0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 12,800,000 | 6,000,000 | $ 300,000
Gain on Sales of Investment Real Estate, Proportionate Share, Equity Method |  | $ 3,300,000 |

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