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Earnings Per Common Share and Stockholders' Equity (Brookfield Asset Management Equity Investment) (Details) | Sep. 30, 2021 | Nov. 30, 2020 boardOfDirectorsSeats $ / shares shares | Oct. 18, 2020 numberOfStages $ / shares
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Third party equity investment, number of stages | numberOfStages |  |  | 2
Third party ownership interest in Company's common stock | 9.50% |  |
Number of Board of Directors seats third party received following initial equity investment | boardOfDirectorsSeats |  | 1 |
Initial Purchase |  |  |
Third party ownership interest in Company's common stock |  | 9.90% |
Third party ownership interest in Company's common stock, price per share |  | $ 37.00 |
Third party ownership interest in Company's common stock, shares | shares |  | 9,106,042 |
Maximum |  |  |
Expected future third party ownership interest in Company's common stock |  |  | 19.90%
Maximum | Second Purchase |  |  |
Expected future third party ownership interest in Company's common stock |  |  | 10.00%
Minimum |  |  |
Expected future third party ownership interest in Company's common stock |  |  | 15.00%
Minimum | Second Purchase |  |  |
Expected future third party ownership interest in Company's common stock, price per share |  |  | $ 37.00

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