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Investment in Real Estate - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 14, 2017
Real Estate [Abstract] |  |  |  |
Revenue of acquiree since acquisition date | $ 14.0 |  |  |
Pro forma, earnings (loss) since acquisition date, actual | (3.5) |  |  |
Gains on sales | 22.9 | $ 30.5 | $ 5.5 |
Gain related to sale of an option to purchase land | $ 7.5 |  |  |
Subsequent Event | 222 Kearny Street |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Proceeds from disposition of real estate held-for-sale |  |  |  | $ 51.8

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