Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Components of Income Taxes for Other than Continuing Operations (Details)

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INCOME TAXES - Components of Income Taxes for Other than Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax $ (52.0) $ 11.0 $ 4.0
Other Comprehensive Income Unrealized Gain Loss On Mark To Market Adjustments Arising During Period Tax (1.0) 0.0 1.0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent $ (53.0) $ 11.0 $ 5.0