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Earnings Per Ordinary Share - Summary of Declared Dividends (Details) - $ / shares			12 Months Ended
	Feb. 07, 2018	Sep. 20, 2016	Dec. 31, 2017	Dec. 31, 2016
5.950% 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%	5.625%
Subsequent Event | Ordinary shares
Dividends Payable [Line Items]
Dividend	$ 0.24
Subsequent Event | 5.950% Preference Shares
Dividends Payable [Line Items]
Dividend	$ 0.3719
Preference shares, rate	5.95%
Subsequent Event | 5.625% Preference Shares
Dividends Payable [Line Items]
Dividend	$ 0.3516
Preference shares, rate	5.625%

X

- 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

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

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