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Accumulated Other Comprehensive Loss ("AOCL") - Changes In Components Of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 355.6    
Other comprehensive income (loss) before reclassifications (11.9) $ (10.1) $ (5.9)
Net amount reclassified to net income (loss) 6.5 6.2 (5.8)
Ending balance 694.4 355.6  
Costs of goods sold [1] 2,035.3 2,093.5 2,730.6
Other income, net (4.5) (3.3) 15.3
Selling, general and administrative expenses 56.8 44.3 37.5
Other operating expense (income), net 6.8 15.8 0.0
Income tax expense 3.2 (14.6) 47.4
Net of tax (336.8) 43.1 14.1
Defined benefit plan and other postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (99.4) (95.6) (84.0)
Other comprehensive income (loss) before reclassifications (11.9) (10.1) (5.9)
Net amount reclassified to net income (loss) 6.7 6.3 (5.7)
Ending balance (104.6) (99.4) (95.6)
Unrealized gain (loss) on financial instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 1.5 1.6 1.7
Other comprehensive income (loss) before reclassifications 0.0 0.0 0.0
Net amount reclassified to net income (loss) (0.2) (0.1) (0.1)
Ending balance 1.3 1.5 1.6
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (97.9) (94.0) (82.3)
Ending balance (103.3) (97.9) (94.0)
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit plan and other postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Costs of goods sold (8.5) (1.0) 3.5
Other income, net 0.0 0.0 (8.9)
Selling, general and administrative expenses 1.1 (0.2) 3.3
Other operating expense (income), net 2.2 (2.6) (9.0)
Income tax expense 0.0 0.0 (0.3)
Net of tax (5.2) (3.8) (11.4)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gain (loss) on financial instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Costs of goods sold (0.2) (0.1) (0.2)
Income tax expense 0.0 0.0 (0.1)
Net of tax $ (0.2) $ (0.1) $ (0.3)
[1]
(1) Including purchases from related party of $277.9 million, $181.4 million and $284.7 million for the years ended December 31, 2024, 2023 and 2022, respectively.