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Shareholders' Equity - Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Feb. 04, 2019 | Oct. 15, 2018 | Jul. 10, 2018 | Apr. 11, 2018 | Feb. 05, 2018
Dividends Payable [Line Items] |  |  |  |  |  |
Minimum percentage of taxable income to be distributed as REIT | 90.00% |  |  |  |  |
Dividend Paid [Member] |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Distribution Per Share (USD per share) |  | $ 0.48 | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.47
Aggregate Payment Amount |  | $ 57.9 | $ 57.2 | $ 57.2 | $ 57.4 | $ 58.3

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