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Earnings Per Share - Additional Information (Details) - shares |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 21, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Earnings Per Share [Abstract] |  |  |  |  |  |
Shares held back in merger to secure indemnification (as a percent) | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% |
Period shares will be held back for | 24 months |  |  |  |  |
Percentage of shares issued on first anniversary of merger | 50.00% |  |  |  |  |
Percentage of shares issued on second anniversary of merger | 50.00% |  |  |  |  |
Treasury shares not included in the calculation of earnings per share (in shares) |  |  |  | 16,790,576 |  | 1,682,110

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU + References No definition available. + Details
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- Definition Business Combination, Shares Held Back To Secure Indemnification, Percentage + References No definition available. + Details
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- Definition Business Combination, Shares Held Back To Secure Indemnification, Period + References No definition available. + Details
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- Definition Business Combination, Shares Held Back To Secure Indemnification, Shares Issued On First Anniversary, Percentage + References No definition available. + Details
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- Definition Business Combination, Shares Held Back To Secure Indemnification, Shares Issued On Second Anniversary, Percentage + References No definition available. + Details
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- References No definition available. + Details
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