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Investments in Real Estate Ventures (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) investment | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in Real Estate Ventures, at Fair Value, Additions | $ 9.0 | $ 50.9 |
Investments in Real Estate Ventures, at Fair Value, Distributions | 9.6 | 16.2 |
Property, Plant and Equipment, Net | 507.0 |  | $ 501.0
Total investments in real estate ventures | $ 352.1 |  | 355.4
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% |  |
Total assets | $ 7,236.0 |  | 7,629.4
Other Liabilities, Noncurrent | 162.5 |  | 161.3
Total liabilities | 4,334.1 |  | 4,807.9
Total liabilities and equity | 7,236.0 |  | 7,629.4
Revenue | 1,615.2 | 1,336.8 |
Net income | 11.3 | 25.2 |
Fair Value [Abstract] |  |  |
Fair value investments at beginning of the period | 212.7 | 155.2 |
Unrealized Gain (Loss) on Investments | (1.7) | 10.3 |
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation | 3.6 | 2.1 |
Fair value investments at end of the period | $ 214.0 | 202.3 |
LaSalle Investment Company II [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Partnership ownership interest (in hundredths) | 48.78% |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 68.4 |  |
Exclusive of LaSalle Investment Company II [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 217.3 |  |
Equity Method Investments [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property, Plant and Equipment, Net | 13.7 |  | 13.8
Total investments in real estate ventures | 10.3 |  | 10.3
Other Assets | 39.5 |  | 40.7
Total assets | 63.5 |  | 64.8
Loans Payable, Fair Value Disclosure | 9.6 |  | 9.7
Other Liabilities, Noncurrent | 25.4 |  | 35.0
Total liabilities | 35.0 |  | 44.7
Members' Equity | 28.5 |  | 20.1
Total liabilities and equity | 63.5 |  | $ 64.8
Revenue | 1.6 | 1.9 |
Other Expenses | (1.2) | (1.9) |
Net income | $ 0.4 | $ 0.0 |

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