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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold $ (591.9) $ (540.4) $ (1,165.2) [1] $ (1,013.4) [1]
Selling, general and administrative expenses (14.0) (12.3) (26.5) (26.4)
Other operating expense - net (1.5) (1.7) (3.5) (2.2)
Income tax effect 1.3 (0.5) (0.3) (1.0)
Net of tax (4.6) (2.5) 25.1 244.3
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 1.5 0.7 2.3 1.6
Selling, general and administrative expenses 0.1 0.1 0.3 0.3
Other operating expense - net 0.0 0.7 0.7 1.4
Income tax effect 0.0 0.0 0.0 0.0
Net of tax 1.6 1.5 3.3 3.3
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 (0.1) 0.0 (0.1) (0.1)
Income tax effect 0.0 0.0 0.0 0.0
Net of tax $ (0.1) $ 0.0 $ (0.1) $ (0.1)
[1]
(1) Purchases from related party were $51.8 million and $56.2 million for the three months ended June 30, 2025 and 2024, respectively. Purchases from related parties were $140.1 million and $115.2 million for the six months ended June 30, 2025 and 2024, respectively.