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Net Income Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 15, 2021 | Dec. 31, 2021 | Nov. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock Repurchase Price per Share |  | $ 1,149.99 |  |  |  |  |  |  |
Preferred Stock, Liquidation Amount per Share |  |  |  | $ 1,291.04 |  |  | $ 1,291.04 | $ 1,347.29 |
Payments for Repurchase of Preferred Stock and Preference Stock | $ 1.1 | $ 43.3 | $ 42.2 | $ 60.0 | $ 0.0 | $ 44.4 | $ 61.6 |  |
Conversion of Stock, Shares Converted |  |  |  |  | 0 |  |  |  |
Exercise price of warrant |  | $ 21.62 |  |  |  | $ 21.62 |  |  |
Exchange of preferred stock for common stock and common stock warrant |  |  |  |  |  | $ 0.0 |  |  |
Preferred Stock Dividends and Other Adjustments |  |  |  |  | $ 0.0 | 37.6 | $ 41.9 |  |
Aggregate Value, Preferred Stock Transactions |  |  |  |  |  | $ 50.8 |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  | 231,276 |  |  | 231,276 | 398,262 |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  | 980 | 36,867 |  |  |  | 62,854 |  |
Stock Repurchase Price per Share |  |  | $ 1,145.2 |  |  |  | $ 954.59 |  |
Preferred Stock, Liquidation Amount per Share |  |  |  |  |  |  |  |  | $ 1,272.78
Preferred Stock, Carrying Value per Share |  |  |  |  |  |  |  |  | 43.80
Preferred Stock, Par Value Per Share |  |  |  |  | $ 1.00 |  |  |  |
Exchange of preferred stock for common stock and common stock warrant |  |  |  |  |  | $ 7.5 |  |  |
Preferred Stock Dividends and Other Adjustments |  |  |  | $ 41.9 |  | $ 37.6 |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  |  | 250,000 |  |  |
Preferred Series B [Member] |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  |  |  |  |  | 37,847 | 62,854 |  |
Conversion of Stock, Shares Converted |  |  |  |  |  | 3,873 |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  |  | $ 1,000

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