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Accumulated Other Comprehensive Loss ("AOCL") - Reclassifications out of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold [1] $ (554.9) $ (457.3) $ (1,720.1) $ (1,470.7)
Selling, general and administrative expenses (17.9) (15.6) (44.4) (42.0)
Other operating expense - net (1.1) (2.4) (4.6) (4.6)
Income tax effect 1.1 (2.0) 0.8 (3.0)
Net of tax 14.9 47.3 40.0 291.6
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 0.6 0.7 2.2 2.3
Selling, general and administrative expenses 0.1 0.2 0.4 0.5
Other operating expense - net 0.8 0.8 2.2 2.2
Income tax effect 0.0 0.0 0.0 0.0
Net of tax 1.5 1.7 4.8 5.0
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 0.0 (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)
[1]
(1) Purchases from related party were $90.7 million and $63.9 million for the three months ended September 30, 2025 and 2024, respectively. Purchases from related party were $230.8 million and $179.1 million for the nine months ended September 30, 2025 and 2024, respectively.