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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, 2019 | Dec. 31, 2018
Private Equity |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | $ 18.6 | $ 24.1
Return on plan assets: |  |
Unrealized | 0.0 | 1.3
Realized | (2.0) | 1.7
Purchases | 0.5 | 1.1
Sales | (4.2) | (9.6)
Ending balance | 12.9 | 18.6
Hedge Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 34.3 | 35.0
Return on plan assets: |  |
Unrealized | 2.3 | (0.6)
Realized | (0.3) | 0.0
Purchases | 0.0 | 0.0
Sales | 0.0 | (0.1)
Ending balance | 36.3 | 34.3
Real Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Beginning balance | 19.9 | 18.7
Return on plan assets: |  |
Unrealized | 0.7 | 1.6
Realized | (0.6) | 0.0
Purchases | 0.1 | 0.3
Sales | (1.2) | (0.7)
Ending balance | $ 18.9 | $ 19.9

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