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Components of Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of goods sold $ (660.4) $ (464.7)
Selling, general and administrative expenses (11.7) (16.1)
Other operating expense - net (0.2) (0.1)
Income tax effect (1.7) 2.3
Net income (loss) 17.7 (140.0)
Reclassification out of accumulated other comprehensive income [Member] | Defined benefit plan and other postretirement liabilities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of goods sold 0.4 0.8
Selling, general and administrative expenses 0.1 0.2
Other operating expense - net 0.2 0.4
Income tax effect (0.1) (0.1)
Net income (loss) 0.6 1.3
Reclassification out of accumulated other comprehensive income [Member] | Unrealized loss on financial instruments [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of goods sold (0.0) (0.0)
Income tax effect 0.0 0.0
Net income (loss) $ 0.0 $ 0.0