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RETIREMENT PLANS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Retirement Benefits [Abstract] |  |  |
Net periodic benefit costs | $ 0.3 | $ 0.6 |
Service cost component | 0.7 | $ 0.8 |
Estimated fair value of plan assets | $ 34.9 |  | $ 39.9
Defer payment and taxation, base salary, percentage (up to) | 75.00% |  |
Defer payment and taxation, bonus and other eligible cash compensation, percentage (up to) | 100.00% |  |
Deferred compensation plan, fair value of assets | $ 4.7 |  | $ 3.8

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