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EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 18, 2024 | Jun. 30, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Feb. 28, 2023
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend on all classes of common stock (in dollars per share) |  |  |  | $ 1.40 | $ 1.40 | $ 1.10 | $ 1.10 | $ 1.10 | $ 1.10 |  |
Capital required for capital adequacy |  | $ 883.7 |  | $ 883.7 |  | $ 862.6 |  |  |  | $ 862.6 |
Capital |  | 1,500.0 |  | 1,500.0 |  | 1,500.0 |  |  |  | 1,500.0 |
Excess capital |  | $ 626.4 |  | $ 626.4 |  | $ 589.4 |  |  |  | $ 589.4 |
Class C non-voting common stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining authorized amount for repurchase |  |  |  |  |  |  |  |  |  |  | $ 9.8
Shares repurchased (in shares) |  | 673,000 |  |  |  |  |  |  |  | 0 |
Shares repurchased |  | $ 19.8 |  |  |  |  |  |  |  |  |
Series C | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate | 6.00% |  |  |  |  |  |  |  |  |  |
Series C | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock |  |  | $ 1.6 |  |  |  |  |  |  |  |

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