STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 2.3	$ 3.4	$ 4.7	$ 7.6
Pre-tax	(23.5)	(20.1)	(39.1)	(48.4)
Amortization of unrecognized prior service credits - Pre-tax	1.7	(6.4)	(4.8)	(13.8)
Income taxes	4.4	2.4	7.0	7.7
Net income (loss)	(13.0)	(61.9)	(24.4)	(88.7)
Amount Reclassified from AOCI | (Gains) losses on qualifying cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pre-tax	0.2	(1.1)	0.7	(1.5)
Income taxes	(0.1)	0.3	(0.2)	0.4
Net income (loss)	0.1	(0.8)	0.5	(1.1)
Amount Reclassified from AOCI | Gains on pension and postretirement items:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized prior service credits - Pre-tax	(1.1)	(1.2)	(2.2)	(2.4)
Income taxes	0.3	0.3	0.5	0.6
Net income (loss)	(0.8)	(0.9)	(1.7)	(1.8)
Commodity contracts | Amount Reclassified from AOCI | (Gains) losses on qualifying cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from discontinued operations, net of tax	0.0	(1.7)	0.0	(3.5)
Swaps | Amount Reclassified from AOCI | (Gains) losses on qualifying cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 0.2	$ 0.6	$ 0.7	$ 2.0