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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, 2022 | Dec. 31, 2021
Private Equity |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | $ 16.1 | $ 9.8
Return on plan assets: |  |
Unrealized | 1.0 | 3.4
Realized | (0.8) | 2.2
Purchases | 2.5 | 4.8
Sales | (5.7) | (4.1)
Ending balance | 13.1 | 16.1
Hedge Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 0.1 | 15.3
Return on plan assets: |  |
Unrealized | (0.1) | (2.1)
Realized | 0.0 | 2.1
Purchases | 0.0 | 0.0
Sales | 0.0 | (15.2)
Ending balance | 0.0 | 0.1
Real Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 4.4 | 16.3
Return on plan assets: |  |
Unrealized | 0.2 | (0.6)
Realized | 0.0 | 0.2
Purchases | 0.2 | 0.1
Sales | 0.0 | (11.6)
Ending balance | $ 4.8 | $ 4.4

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