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Accumulated Other Comprehensive Loss (AOCL) - Changes In Components Of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Balance, start       $ 675.0       $ 762.2 $ 675.0 $ 762.2 $ 829.6
Other comprehensive (loss) before reclassifications                 (13.5) (12.7) (7.3)
Net amount reclassified to net income (loss)                 4.5 2.9 0.3
Impact of ASU 2018-02               (1.3)   (1.3)  
Balance, end $ 546.1       $ 675.0       546.1 675.0 762.2
Cost of Goods and Services Sold                 1,641.6 1,860.5 1,916.1
Selling, General and Administrative Expense                 43.5 47.4 40.2
Other operating expense, net                 (0.5) (0.8) (0.4)
Income tax benefit (expense)                 3.1 8.4 0.2
Net income (loss) (35.5) $ (58.2) $ (26.9) (2.7) (4.8) $ (20.7) $ (20.7) (34.6) (123.3) (80.8) (66.2)
Defined benefit plan and other postretirement liabilities                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Balance, start       (111.7)       (100.7) (111.7) (100.7) (93.8)
Other comprehensive (loss) before reclassifications                 (13.5) (12.7) (7.3)
Net amount reclassified to net income (loss)                 4.6 3.0 0.4
Impact of ASU 2018-02                   (1.3)  
Balance, end (120.6)       (111.7)       (120.6) (111.7) (100.7)
Unrealized gain (loss) on financial instruments                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Balance, start       1.9       2.0 1.9 2.0 2.1
Other comprehensive (loss) before reclassifications                 0.0 0.0 0.0
Net amount reclassified to net income (loss)                 (0.1) (0.1) (0.1)
Impact of ASU 2018-02                   0.0  
Balance, end 1.8       1.9       1.8 1.9 2.0
Accumulated other comprehensive loss                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Balance, start       $ (109.8)       $ (98.7) (109.8) (98.7) (91.7)
Balance, end $ (118.8)       $ (109.8)       (118.8) (109.8) (98.7)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plan and other postretirement liabilities                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Cost of Goods and Services Sold                 (4.7) (3.2) 2.8
Selling, General and Administrative Expense                 (2.0) (4.4) (1.9)
Other operating expense, net                 (1.1) (1.0) 1.2
Income tax benefit (expense)                 (1.1) (1.1) (1.6)
Net income (loss)                 (8.9) (9.7) 0.5
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gain (loss) on financial instruments                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Cost of Goods and Services Sold                 (0.2) (0.2) (0.2)
Income tax benefit (expense)                 0.1 0.1 0.0
Net income (loss)                 $ (0.1) $ (0.1) $ (0.2)