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RETIREMENT PLANS - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Retirement Benefits [Abstract] |  |  |  |  |  |
Net periodic benefit costs |  | $ 1.0 | $ 0.5 | $ 1.9 | $ 1.0 |
Service cost component |  | 0.9 | $ 0.7 | 1.9 | $ 1.3 |
Estimated fair value of plan assets |  | 31.9 |  | 31.9 |  | $ 30.8
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 |  | $ 1.5 |  | $ 1.5 |  |

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