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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income (Loss) Components (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | $ (0.2) | $ (0.2) | $ (0.5) | $ (0.4)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax | 7.3 | 7.1 | 14.7 | 14.3
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 7.1 | 6.9 | 14.2 | 13.9
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | (1.5) | (1.4) | (3.0) | (2.9)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 5.6 | 5.5 | 11.2 | 11.0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 3.9 | 0.2 | 6.7 | 0.5
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax | (0.8) | 0.0 | (1.4) | (0.1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax | 3.1 | 0.2 | 5.3 | 0.4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 8.7 | $ 5.7 | $ 16.5 | $ 11.4

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