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History, Organization and Business Combination - Class of Stock (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
5.95% preference shares
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	5.95%	5.95%
5.625% preference shares
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	5.625%	5.625%

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- Definition

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

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