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EQUITY - Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended | 24 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) shares | Dec. 31, 2023 USD ($) classOfCommonStockOutstanding $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Mar. 10, 2023 shares | Mar. 31, 2023 USD ($) | Mar. 10, 2021 USD ($) | Dec. 31, 2020 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 |  | $ 1.10 | $ 0.95 | $ 0.88 |  |  |  |
Share expiration period |  | 10 years |  |  |  |  |  |
SARs exercise price (in dollars per share) | $ / shares |  | $ 135.12 | $ 120.38 | $ 88.68 |  |  |  |
Decrease in additional paid-in capital |  | $ 3.1 | $ 1.9 | $ 1.3 |  |  |  |
Intrinsic value of outstanding, exercisable and vested or excepted to vest restricted stock | $ 35.0 | 35.0 | 16.3 |  |  |  |  |
Intrinsic value of shares exercised |  | 2.4 | $ 1.1 | $ 0.9 |  |  |  |
Unrecognized compensation cost | 7.7 | $ 7.7 |  |  |  |  |  |
Weighted-average period of recognition |  | 1 year 10 months 24 days |  |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) | $ / shares |  | $ 114.68 | $ 91.94 | $ 65.48 |  |  |  |
Compensation expense |  | $ 6.8 | $ 4.6 | $ 4.3 |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 135.56 | $ 120.14 | $ 88.92 |  |  |  |
Capital required for capital adequacy | 862.6 | $ 862.6 | $ 805.9 |  |  |  |  |
Capital | 1,500.0 | 1,500.0 | 1,300.0 |  |  |  |  |
Excess capital | $ 589.4 | 589.4 | 516.9 |  |  |  |  |
SARs |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Tax benefit from exercise of SARs |  | $ 1.7 | $ 1.2 | $ 0.9 |  |  |  |
Outstanding, SARs (in shares) | shares | 125,952 | 125,952 | 132,163 | 130,409 |  |  |  | 116,417
Stock option |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Outstanding, SARs (in shares) | shares | 0 | 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] |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares | 673,000 | 0 |  |  | 0 |  |  |
Shares repurchased | $ 19.8 |  |  |  |  |  |  |
Remaining authorized amount for repurchase |  |  |  |  |  | $ 9.8 | $ 9.8 |
Stock repurchase, period |  |  |  |  | 2 years |  |  |

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