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Shareholders' Equity - Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Jul. 10, 2017 | Apr. 25, 2017 | Feb. 06, 2017 | Oct. 18, 2016 | Jul. 20, 2016 | Apr. 20, 2016 | Feb. 03, 2016
Equity [Abstract] |  |  |  |  |  |  |  |
Minimum percentage of taxable income to be distributed as REIT | 90.00% |  |  |  |  |  |  |
Distribution Per Share (USD per share) |  | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.43 | $ 0.43 | $ 0.43 | $ 0.43
Aggregate Payment Amount |  | $ 58.3 | $ 58.4 | $ 52.5 | $ 48.8 | $ 48.7 | $ 48.7 | $ 48.5

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