Summary of Significant Accounting Policies - Earnings Per Share (Details) |
6 Months Ended |
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Jun. 30, 2019
shares
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| Accounting Policies [Abstract] | |
| Number of shares of common stock received for each exchangeable share (in shares) | 1 |
| X | ||||||||||
- Definition Number of shares of common stock received for each exchangeable share. No definition available.
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| X | ||||||||||
- References No definition available.
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