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Equities - Summary of Outstanding Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2023 | Aug. 31, 2022
Class of Stock [Line Items] |  |
Preferred Stock, Liquidation Preference Per Share | $ 25.00 |
8% Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ 2.00 | $ 2.00
Preferred Stock, Shares Outstanding | 12,272,003 |
Preferred Stock, Redemption Amount | $ 306.8 |
Proceeds from issuance of preferred stock, net of issuance costs | $ 311.2 |
Preferred Stock, Dividend Rate, Percentage | 8.00% |
Class B, Series 1 Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ 1.97 | 1.97
Preferred Stock, Shares Outstanding | 21,459,066 |
Preferred Stock, Redemption Amount | $ 536.5 |
Proceeds from issuance of preferred stock, net of issuance costs | $ 569.3 |
Preferred Stock, Dividend Rate, Percentage | 7.875% |
Class B, Series 2 Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ 1.78 | 1.78
Preferred Stock, Shares Outstanding | 16,800,000 |
Preferred Stock, Redemption Amount | $ 420.0 |
Proceeds from issuance of preferred stock, net of issuance costs | $ 406.2 |
Preferred Stock, Dividend Rate, Percentage | 7.10% |
Class B, Series 2 Preferred Stock [Member] | Maximum |  |
Class of Stock [Line Items] |  |
Preferred Stock, Basis Spread on Dividends, Percent | 8.00% |
Class B, Series 2 Preferred Stock [Member] | variable rate |  |
Class of Stock [Line Items] |  |
Preferred Stock, Basis Spread on Dividends, Percent | 4.298% |
Class B, Series 3 Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ 1.69 | 1.69
Preferred Stock, Shares Outstanding | 19,700,000 |
Preferred Stock, Redemption Amount | $ 492.5 |
Proceeds from issuance of preferred stock, net of issuance costs | $ 476.7 |
Preferred Stock, Dividend Rate, Percentage | 6.75% |
Class B, Series 3 Preferred Stock [Member] | Maximum |  |
Class of Stock [Line Items] |  |
Preferred Stock, Basis Spread on Dividends, Percent | 8.00% |
Class B, Series 3 Preferred Stock [Member] | variable rate |  |
Class of Stock [Line Items] |  |
Preferred Stock, Basis Spread on Dividends, Percent | 4.155% |
Class B, Series 4 Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ 1.88 | $ 1.88
Preferred Stock, Shares Outstanding | 20,700,000 |
Preferred Stock, Redemption Amount | $ 517.5 |
Proceeds from issuance of preferred stock, net of issuance costs | $ 501.0 |
Preferred Stock, Dividend Rate, Percentage | 7.50% |

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