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History, Organization and Business Combination - Class of Stock (Details)		12 Months Ended
	Sep. 20, 2016	Dec. 31, 2018	Dec. 31, 2017
5.950% Preference Shares
Class of Stock [Line Items]
Preference shares, rate		5.95%	5.95%
5.625% Preference Shares
Class of Stock [Line Items]
Preference shares, rate	5.625%	5.625%	5.625%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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