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Accumulated Other Comprehensive Loss ("AOCL") - Reclassifications out of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold $ (540.4) $ (559.6) $ (1,013.4) $ (1,063.9)
Selling, general and administrative expenses (12.3) (12.0) (26.4) (25.4)
Other operating expense - net (1.7) (4.6) (2.2) (11.8)
Income tax effect (0.5) 10.0 (1.0) 10.2
Net of tax (2.5) 7.5 244.3 (31.1)
Reclassification out of accumulated other comprehensive income | Defined benefit plan and other postretirement liabilities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold 0.7 1.4 1.6 2.2
Selling, general and administrative expenses 0.1 0.1 0.3 0.3
Other operating expense - net 0.7 0.7 1.4 0.9
Income tax effect 0.0 0.0 0.0 0.0
Net of tax 1.5 2.2 3.3 3.4
Reclassification out of accumulated other comprehensive income | Unrealized gain (loss) on financial instruments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold 0.0 0.0 (0.1) (0.1)
Income tax effect 0.0 0.0 0.0 0.0
Net of tax $ 0.0 $ 0.0 $ (0.1) $ (0.1)