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Earnings per Ordinary Share - Summary of Declared Dividends (Details) - $ / shares |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 25, 2017 | Sep. 30, 2017 | Dec. 31, 2016
5.95% preference shares |  |  |
Dividends Payable [Line Items] |  |  |
Preference shares, rate |  | 5.95% | 5.95%
5.625% preference shares |  |  |
Dividends Payable [Line Items] |  |  |
Preference shares, rate |  | 5.625% | 5.625%
Subsequent Event | Ordinary shares |  |  |
Dividends Payable [Line Items] |  |  |
Dividend (in usd per share) | $ 0.24 |  |
Payable Date | Nov. 28, 2017 |  |
Record Date | Nov. 10, 2017 |  |
Subsequent Event | 5.95% preference shares |  |  |
Dividends Payable [Line Items] |  |  |
Dividend (in usd per share) | $ 0.3719 |  |
Payable Date | Jan. 01, 2018 |  |
Record Date | Dec. 15, 2017 |  |
Subsequent Event | 5.625% preference shares |  |  |
Dividends Payable [Line Items] |  |  |
Dividend (in usd per share) | $ 0.35156 |  |
Payable Date | Jan. 01, 2018 |  |
Record Date | Dec. 15, 2017 |  |

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