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Real Estate Investments - Summary of Land Parcels Sold (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2017 | Dec. 31, 2016
Bishops Gate [Member] | Land [Member] |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Provision for impairment on assets held for sale | $ 0.3 | $ 3.0

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