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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, 2023
Dec. 31, 2022
Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 399.3    
Other comprehensive income (loss) before reclassifications (10.1) $ (5.9) $ 31.6
Net amount reclassified to net income (loss) 6.2 (5.8) 4.9
Ending balance 355.6 399.3  
Cost of goods sold 2,093.5 2,730.6 2,088.3
Other income, net (3.3) 15.3 3.1
Selling, general and administrative expenses 44.3 37.5 57.6
Other operating expense (income), net 15.8 0.0 0.6
Income tax benefit (expense) (14.6) 47.4 (30.6)
Net loss 43.1 14.1 167.1
Defined benefit plan and other postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (95.6) (84.0) (120.6)
Other comprehensive income (loss) before reclassifications (10.1) (5.9) 31.6
Net amount reclassified to net income (loss) 6.3 (5.7) 5.0
Ending balance (99.4) (95.6) (84.0)
Unrealized gain (loss) on financial instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 1.6 1.7 1.8
Other comprehensive income (loss) before reclassifications 0.0 0.0 0.0
Net amount reclassified to net income (loss) (0.1) (0.1) (0.1)
Ending balance 1.5 1.6 1.7
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (94.0) (82.3) (118.8)
Ending balance (97.9) (94.0) (82.3)
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit plan and other postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cost of goods sold (1.0) 3.5 26.8
Other income, net 0.0 (8.9) 0.0
Selling, general and administrative expenses (0.2) 3.3 2.9
Other operating expense (income), net (2.6) (9.0) 7.3
Income tax benefit (expense) 0.0 (0.3) (0.4)
Net loss (3.8) (11.4) 36.6
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gain (loss) on financial instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cost of goods sold (0.1) (0.2) (0.1)
Income tax benefit (expense) 0.0 (0.1) 0.0
Net loss $ (0.1) $ (0.3) $ (0.1)