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BENEFIT PLANS - FAIR VALUE OF PENSION PLAN ASSETS (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 185.1 | $ 173.1 | $ 185.7
Mutual funds | Equity |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Percentage of investments | 50.00% |  |
Mutual funds | Fixed Income Investments |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Percentage of investments | 50.00% |  |
Common trusts | Equity |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Percentage of investments | 65.00% |  |
Common trusts | Fixed Income Investments |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Percentage of investments | 35.00% |  |
Cash and cash equivalents |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 12.9 | 12.4 |
Equity Securities | International |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 55.1 | 47.2 |
Fixed Income Securities | Fixed rate bonds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 55.1 | 49.2 |
Other Investments | Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 18.3 | 17.4 |
Other Investments | Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 4.3 | 11.8 |
Other Investments | Insurance contracts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 30.1 | 27.7 |
Other Investments | Hedge funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 8.9 | 7.1 |
Other Investments | Real estate |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.4 | 0.3 |
Level 1 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 141.4 | 126.2 |
Level 1 | Cash and cash equivalents |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 12.9 | 12.4 |
Level 1 | Equity Securities | International |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 55.1 | 47.2 |
Level 1 | Fixed Income Securities | Fixed rate bonds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 55.1 | 49.2 |
Level 1 | Other Investments | Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 18.3 | 17.4 |
Level 1 | Other Investments | Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 1 | Other Investments | Insurance contracts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 1 | Other Investments | Hedge funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 1 | Other Investments | Real estate |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 2 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 4.3 | 11.8 |
Level 2 | Cash and cash equivalents |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 2 | Equity Securities | International |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 2 | Fixed Income Securities | Fixed rate bonds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 2 | Other Investments | Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 2 | Other Investments | Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 4.3 | 11.8 |
Level 2 | Other Investments | Insurance contracts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 2 | Other Investments | Hedge funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 2 | Other Investments | Real estate |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 3 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 39.4 | 35.1 | $ 36.4
Level 3 | Cash and cash equivalents |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 3 | Equity Securities | International |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 3 | Fixed Income Securities | Fixed rate bonds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 3 | Other Investments | Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 3 | Other Investments | Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Level 3 | Other Investments | Insurance contracts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 30.1 | 27.7 |
Level 3 | Other Investments | Hedge funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 8.9 | 7.1 |
Level 3 | Other Investments | Real estate |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 0.4 | $ 0.3 |

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