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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Class of Stock Disclosures [Abstract] |
Summary of Repurchases of Common Stock | Repurchases of Common Stock were as follows (in millions, except share amounts):
| Year Ended December 31, |  |  | (transition period) Three Months Ended December 31, |  |  | Year Ended September 30, |
| 2023 |  |  | 2022 |  |  | 2021 |  |  | 2021 |
Shares of Common Stock repurchased |  | 265,795 |  |  |  | 1,508,467 |  |  |  | 1,362,831 |  |  |  | 927,934 |
Cost of shares of Common Stock repurchased | $ | 22.5 |  |  | $ | 155.0 |  |  | $ | 150.0 |  |  | $ | 107.8 |

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