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Shareholders' Equity - Dividends declared (Details) $ / shares in Units, $ in Millions | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Feb. 06, 2017 USD ($) | Feb. 06, 2017 £ / shares | Oct. 18, 2016 USD ($) | Oct. 18, 2016 £ / shares | Jul. 20, 2016 USD ($) $ / shares | Apr. 20, 2016 USD ($) $ / shares | Feb. 03, 2016 USD ($) $ / shares
Equity [Abstract] |  |  |  |  |  |  |  |
Minimum percentage of taxable income to be distributed as REIT | 90.00% |  |  |  |  |  |  |
Distribution Per Share (USD per share) | (per share) |  |  | £ 0.47 |  | £ 0.43 | $ 0.43 | $ 0.43 | $ 0.43
Aggregate Payment Amount |  | $ 52.5 |  | $ 48.8 |  | $ 48.7 | $ 48.7 | $ 48.5

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