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Earnings per Ordinary Share - Summary of Declared Dividends (Details) - $ / shares |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 01, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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 | Sep. 04, 2018 |  |
Record Date | Aug. 17, 2018 |  |
Subsequent Event | 5.95% preference shares |  |  |
Dividends Payable [Line Items] |  |  |
Dividend (in usd per share) | $ 0.3719 |  |
Payable Date | Oct. 01, 2018 |  |
Record Date | Sep. 15, 2018 |  |
Subsequent Event | 5.625% preference shares |  |  |
Dividends Payable [Line Items] |  |  |
Dividend (in usd per share) | $ 0.35156 |  |
Payable Date | Oct. 01, 2018 |  |
Record Date | Sep. 15, 2018 |  |

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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