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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, 2018 | Dec. 31, 2017
Private Equity |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Balance at December 31, 2017 | $ 24.1 | $ 33.5
Return on plan assets: |  |
Unrealized | 1.3 | (1.8)
Realized | 1.7 | 1.0
Purchases | 1.1 | 1.0
Sales | (9.6) | (9.6)
Balance at December 31, 2018 | 18.6 | 24.1
Hedge Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Balance at December 31, 2017 | 35.0 | 33.7
Return on plan assets: |  |
Unrealized | (0.6) | 1.8
Realized | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales | (0.1) | (0.5)
Balance at December 31, 2018 | 34.3 | 35.0
Real Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward] |  |
Balance at December 31, 2017 | 18.7 | 19.3
Return on plan assets: |  |
Unrealized | 1.6 | 0.1
Realized | 0.0 | (0.1)
Purchases | 0.3 | 0.5
Sales | (0.7) | (1.1)
Balance at December 31, 2018 | $ 19.9 | $ 18.7

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