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Investments in Real Estate Ventures (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) investment | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) investment | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 97.1 |  | $ 97.1 |  |
Number of separate property or fund co-investments | investment | 51 |  | 51 |  |
Minimum ownership percentage in real estate ventures (in hundredths) | 1.00% |  | 1.00% |  |
Maximum ownership percentage in real estate ventures (in hundredths) | 15.00% |  | 15.00% |  |
Property, Plant and Equipment, Net | $ 432.4 |  | $ 432.4 |  | $ 423.3
Total investments in real estate ventures | 357.8 |  | 357.8 |  | 311.5
Assets | 6,341.3 |  | 6,341.3 |  | 6,187.1
Other Liabilities, Noncurrent | 238.1 |  | 238.1 |  | 208.5
Liabilities | 3,524.7 |  | 3,524.7 |  | 3,457.7
Liabilities and Equity | 6,341.3 |  | 6,341.3 |  | 6,187.1
Revenue | 1,603.6 | $ 1,373.5 | 2,940.4 | $ 2,577.0 |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 94.4 | 91.4 | 119.6 | 134.7 |
Impairment [Abstract] |  |  |  |  |
Impairment charges | 0.2 | 0.6 | 0.7 | 4.2 |
Fair Value [Abstract] |  |  |  |  |
Fair value investments at beginning of the period |  |  | 155.2 | 113.6 |
Investments |  |  | 52.0 | 22.7 |
Distributions |  |  | 21.9 | 2.7 |
Unrealized Gain (Loss) on Investments |  |  | 12.2 | 7.0 |
Foreign currency translation adjustments, net |  |  | 6.3 | (1.6) |
Fair value investments at end of the period | 203.8 | 139.0 | 203.8 | 139.0 |
LaSalle Investment Company II [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 69.9 |  | $ 69.9 |  |
Partnership ownership interest (in hundredths) | 48.78% |  | 48.78% |  |
Unfunded capital commitments to the underlying funds for future funding of co-investments | $ 72.5 |  | $ 72.5 |  |
Revolving credit facility, maximum capacity | 10.0 |  | 10.0 |  |
Entity share of Unfunded Capital Commitments for Future Fundings | 35.4 |  | 35.4 |  |
Entity Share Of Exposure On Outstanding Borrowings | 3.6 |  | 3.6 |  |
Entity's maximum exposure, assuming facility was fully drawn | 4.9 |  | 4.9 |  |
Consolidated Variable Interest Entities [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Property, Plant and Equipment, Net | 13.9 |  | 13.9 |  | 32.6
Total investments in real estate ventures | 7.0 |  | 7.0 |  | 6.6
Other Assets | 43.2 |  | 43.2 |  | 4.9
Assets | 64.1 |  | 64.1 |  | 44.1
Other Liabilities, Noncurrent | 9.8 |  | 9.8 |  | 25.8
Due to Related Parties | 0.9 |  | 0.9 |  | 0.0
Liabilities | 10.7 |  | 10.7 |  | 25.8
Members' Equity | 53.4 |  | 53.4 |  | 18.3
Liabilities and Equity | 64.1 |  | 64.1 |  | $ 44.1
Revenue | 1.1 | 1.3 | 3.0 | 2.4 |
Other Expenses | (0.1) | (0.9) | (2.0) | (1.8) |
Gains (Losses) on Sales of Investment Real Estate | 13.3 | 0.0 | 13.3 | 1.3 |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 14.3 | $ 0.4 | $ 14.3 | $ 1.9 |

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