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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, 2021 | Dec. 31, 2020
Private Equity |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | $ 9.8 | $ 12.9
Return on plan assets: |  |
Unrealized | 3.4 | (0.1)
Realized | 2.2 | (1.0)
Purchases | 4.8 | 0.1
Sales | (4.1) | (2.1)
Ending balance | 16.1 | 9.8
Hedge Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 15.3 | 36.3
Return on plan assets: |  |
Unrealized | (2.1) | 0.0
Realized | 2.1 | (1.3)
Purchases | 0.0 | 0.0
Sales | (15.2) | (19.7)
Ending balance | 0.1 | 15.3
Real Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 16.3 | 18.9
Return on plan assets: |  |
Unrealized | (0.6) | (0.1)
Realized | 0.2 | 0.1
Purchases | 0.1 | 0.1
Sales | (11.6) | (2.7)
Ending balance | $ 4.4 | $ 16.3

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