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Accumulated Other Comprehensive Loss ("AOCL") - Reclassifications out of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of goods sold [1] $ (573.3) $ (473.0)
Selling, general and administrative expenses (12.5) (14.1)
Other operating expense - net (2.0) (0.5)
Income tax effect (1.6) (0.5)
Net of tax 29.7 246.8
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 0.8 0.9
Selling, general and administrative expenses 0.2 0.2
Other operating expense - net 0.7 0.7
Income tax effect 0.0 0.0
Net of tax 1.7 1.8
Reclassification out of accumulated other comprehensive income | Unrealized gain on financial instruments    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of goods sold 0.0 (0.1)
Income tax effect 0.0 0.0
Net of tax $ 0.0 $ (0.1)
[1]
(1) Purchases from related party were $88.3 million and $59.0 million for the quarters ended March 31, 2025 and 2024, respectively.