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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, 2020 | Dec. 31, 2019
Private Equity |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | $ 12.9 | $ 18.6
Return on plan assets: |  |
Unrealized | (0.1) | 0.0
Realized | (1.0) | (2.0)
Purchases | 0.1 | 0.5
Sales | (2.1) | (4.2)
Ending balance | 9.8 | 12.9
Hedge Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 36.3 | 34.3
Return on plan assets: |  |
Unrealized | 0.0 | 2.3
Realized | (1.3) | (0.3)
Purchases | 0.0 | 0.0
Sales | (19.7) | 0.0
Ending balance | 15.3 | 36.3
Real Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 18.9 | 19.9
Return on plan assets: |  |
Unrealized | (0.1) | 0.7
Realized | 0.1 | (0.6)
Purchases | 0.1 | 0.1
Sales | (2.7) | (1.2)
Ending balance | $ 16.3 | $ 18.9

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