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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, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start $ 546.1 $ 675.0 $ 762.2
Impact of ASU 2018-02     1.3
Other comprehensive (loss) before reclassifications 31.6 (13.5) (12.7)
Net amount reclassified to net income (loss) 4.9 4.5 2.9
Balance, end 421.0 546.1 675.0
Cost of goods sold 2,088.3 1,641.6 1,860.5
Selling, general and administrative expenses 57.6 43.5 47.4
Other operating expense, net 0.6 0.5 0.8
Income tax benefit (expense) (30.6) (3.1) (8.4)
Net income (loss) 167.1 123.3 80.8
Defined benefit plan and other postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start (120.6) (111.7) (100.7)
Impact of ASU 2018-02     1.3
Other comprehensive (loss) before reclassifications 31.6 (13.5) (12.7)
Net amount reclassified to net income (loss) 5.0 4.6 3.0
Balance, end (84.0) (120.6) (111.7)
Unrealized gain (loss) on financial instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start 1.8 1.9 2.0
Impact of ASU 2018-02     0.0
Other comprehensive (loss) before reclassifications 0.0 0.0 0.0
Net amount reclassified to net income (loss) (0.1) (0.1) (0.1)
Balance, end 1.7 1.8 1.9
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start (118.8) (109.8) (98.7)
Balance, end (82.3) (118.8) (109.8)
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 26.8 (4.7) (3.2)
Selling, general and administrative expenses 2.9 (2.0) (4.4)
Other operating expense, net 7.3 (1.1) (1.0)
Income tax benefit (expense) (0.4) (1.1) (1.1)
Net income (loss) 36.6 (8.9) (9.7)
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) (0.2)
Income tax benefit (expense) 0.0 0.1 0.1
Net income (loss) $ (0.1) $ (0.1) $ (0.1)