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Investments in Real Estate Ventures (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) investment | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) investment | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in real estate ventures | $ 364.2 |  | $ 364.2 |  | $ 355.4
Number of separate property or fund co-investments | investment | 49 |  | 49 |  |
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 | $ 512.9 |  | $ 512.9 |  | 501.0
Investments in real estate ventures, consolidated VIE | 364.2 |  | 364.2 |  | 355.4
Total assets | 7,897.9 |  | 7,897.9 |  | 7,629.4
Other Liabilities, Noncurrent, consolidated VIE | 166.5 |  | 166.5 |  | 161.3
Total liabilities | 4,860.2 |  | 4,860.2 |  | 4,807.9
Total liabilities and equity | 7,897.9 |  | 7,897.9 |  | 7,629.4
Revenue, consolidated VIE | 1,834.7 | $ 1,603.6 | 3,449.9 | $ 2,940.4 |
Net income | 78.7 | 94.4 | 90.0 | 119.6 |
Fair Value [Abstract] |  |  |  |  |
Fair value investments at beginning of the period |  |  | 212.7 | 155.2 |
Investments in Real Estate Ventures, at Fair Value, Additions |  |  | 19.2 | 52.0 |
Investments in Real Estate Ventures, at Fair Value, Distributions |  |  | 18.6 | 21.9 |
Unrealized Gain (Loss) on Investments |  |  | 10.7 | 12.2 |
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation |  |  | 4.0 | 6.3 |
Fair value investments at end of the period | $ 228.0 | 203.8 | $ 228.0 | 203.8 |
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 | $ 68.0 |  | $ 68.0 |  |
Exclusive of LaSalle Investment Company II [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 215.3 |  | 215.3 |  |
Equity Method Investments [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in real estate ventures | 10.4 |  | 10.4 |  | 10.3
Property, Plant and Equipment, Net, consolidated VIE | 13.6 |  | 13.6 |  | 13.8
Investments in real estate ventures, consolidated VIE | 10.4 |  | 10.4 |  | 10.3
Other Assets, consolidated VIE | 40.2 |  | 40.2 |  | 40.7
Total assets | 64.2 |  | 64.2 |  | 64.8
Loans Payable, Fair Value Disclosure, consolidated VIE | 9.3 |  | 9.3 |  | 9.7
Other Liabilities, Noncurrent, consolidated VIE | 31.3 |  | 31.3 |  | 35.0
Total liabilities | 40.6 |  | 40.6 |  | 44.7
Members' Equity, consolidated VIE | 23.6 |  | 23.6 |  | 20.1
Total liabilities and equity | 64.2 |  | 64.2 |  | $ 64.8
Revenue, consolidated VIE | 1.0 | 1.1 | 2.6 | 3.0 |
Other Expenses, consolidated VIE | (0.8) | (0.1) | (2.0) | (2.0) |
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE | 0.0 | 13.3 | 0.0 | 13.3 |
Net income | $ 0.2 | $ 14.3 | $ 0.6 | $ 14.3 |

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