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EQUITY - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 18, 2024 | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) classOfCommonStockOutstanding $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Feb. 28, 2023 USD ($) | Dec. 31, 2021 shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of classes of common stock outstanding | classOfCommonStockOutstanding |  |  | 3 |  |  |  |
Quarterly dividend on all classes of common stock (in dollars per share) | $ / shares |  |  | $ 1.40 | $ 1.10 | $ 0.95 |  |
Share expiration period |  |  | 10 years |  |  |  |
SARs exercise price (in dollars per share) | $ / shares |  |  | $ 198.54 | $ 135.12 | $ 120.38 |  |
Decrease in additional paid-in capital |  |  | $ 5.4 | $ 3.1 | $ 1.9 |  |
Intrinsic value of outstanding, exercisable and vested or excepted to vest restricted stock |  |  | 28.4 | 35.0 |  |  |
Intrinsic value of shares exercised |  |  | 4.6 | $ 2.4 | $ 1.1 |  |
Unrecognized compensation cost |  |  | $ 7.5 |  |  |  |
Weighted-average period of recognition |  |  | 1 year 8 months 12 days |  |  |  |
Weighted-average grant date fair value (in dollars per share) | $ / shares |  |  | $ 159.08 | $ 114.68 | $ 91.94 |  |
Compensation expense |  |  | $ 8.1 | $ 6.8 | $ 4.6 |  |
Granted (in dollars per share) | $ / shares |  |  | $ 197.52 | $ 135.56 | $ 120.14 |  |
Capital required for capital adequacy |  |  | $ 917.6 | $ 862.6 |  |  |
Capital |  |  | 1,500.0 | 1,500.0 |  |  |
Excess capital |  |  | 583.5 | 589.4 |  |  |
SARs |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Tax benefit from exercise of SARs |  |  | $ 3.0 | $ 1.7 | $ 1.2 |  |
Outstanding, SARs (in shares) | shares |  |  | 106,689 | 125,952 | 132,163 |  | 130,409
Stock option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Outstanding, SARs (in shares) | shares |  |  | 0 |  |  |  |
Minimum | Restricted Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 1 year | 1 year | 1 year |  |
Maximum | Restricted Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 3 years | 3 years | 3 years |  |
Class C non-voting common stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Remaining authorized amount for repurchase |  |  |  |  |  | $ 9.8 |
Shares repurchased (in shares) | shares |  |  | 673,000 |  |  |  |
Shares repurchased |  |  | $ 19.8 |  |  |  |
Series C |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate | 6.00% |  | 6.00% | 6.00% | 6.00% |  |
Loss on retirement of preferred stock |  | $ 1.6 |  |  |  |  |

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