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Shareholders' Equity - Dividends declared (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Apr. 29, 2015 | Feb. 06, 2015 | Nov. 05, 2014 | Aug. 05, 2014 | Apr. 28, 2014 | Feb. 18, 2014
Dividends declared/paid [Abstract] |  |  |  |  |  |  |
Minimum percentage of taxable income to be distributed as REIT | 90.00% |  |  |  |  |  |
Distribution Per Share |  | $ 0.62 | $ 0.62 | $ 0.62 | $ 0.57 | $ 0.57 | $ 0.57
Aggregate Payment Amount (in millions) |  | $ 46.3 | $ 46.0 | $ 46.0 | $ 41.4 | $ 41.5 | $ 41.1

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