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POSTRETIREMENT BENEFIT PLANS Pension Plan Termination (Details) - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Oct. 20, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Subsequent Event [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 7.2 | $ 19.7
US. Qualified Pension Plan Termination [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 321.0 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 8.4 |  |
US. Qualified Pension Plan Termination [Member] | Subsequent Event [Member] | Minimum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Estimated Non Cash Pension Settlement Charge | 135.0 |  |
US. Qualified Pension Plan Termination [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Estimated Non Cash Pension Settlement Charge | $ 140.0 |  |

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