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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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