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BENEFIT PLANS - Reconciliation of Beginning and Ending Balances for Plan Assets Valued using Significant Unobservable Inputs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Private Equity |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | $ 13.1 | $ 16.1
Return on plan assets: |  |
Unrealized | 0.7 | 1.0
Realized | (0.3) | (0.8)
Purchases | 1.7 | 2.5
Sales | (1.4) | (5.7)
Ending balance | 13.8 | 13.1
Hedge Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 0.0 | 0.1
Return on plan assets: |  |
Unrealized | 0.0 | (0.1)
Realized | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales | 0.0 | 0.0
Ending balance | 0.0 | 0.0
Real Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 4.8 | 4.4
Return on plan assets: |  |
Unrealized | 0.0 | 0.2
Realized | 0.0 | 0.0
Purchases | 0.0 | 0.2
Sales | 0.0 | 0.0
Ending balance | $ 4.8 | $ 4.8

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