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STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Components of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Pre-tax $ (102.2) $ (69.9) $ (179.6) $ (127.8)
Amortization of unrecognized prior service credits - Pre-tax 5.1 2.1 8.1 (0.6)
Income taxes 22.9 17.4 35.9 23.6
Net income (loss) (78.4) (52.2) (138.3) (103.4)
Amount Reclassified from AOCI | Gains on qualifying cash flow hedges:        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense 0.0 (0.6) 0.0 (1.6)
Pre-tax 0.0 (0.6) 0.0 (1.6)
Income taxes 0.0 0.0 0.0 0.3
Net income (loss) 0.0 (0.6) 0.0 (1.3)
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 (0.2) (0.8) (0.4) (1.6)
Income taxes 0.0 0.3 0.0 0.5
Net income (loss) $ (0.2) $ (0.5) $ (0.4) $ (1.1)