XML 76 R57.htm IDEA: XBRL DOCUMENT
v3.10.0.1

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%

X
- 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. + References No definition available. + Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesDPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesEPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |