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Components of Accumulated Other Comprehensive Loss - Reclassifications out of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold $ (559.6) $ (840.7) $ (1,063.9) $ (1,501.1)
Selling, general and administrative expenses (12.0) (5.8) (25.4) (17.5)
Other operating expense - net (4.6) (0.2) (11.8) (0.4)
Income tax effect 10.0 (42.3) 10.2 (44.0)
Net income (loss) attributable to Century stockholders 7.5 37.4 (31.1) 55.1
Reclassification out of accumulated other comprehensive income | Defined benefit plan and other postretirement liabilities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold 1.4 0.5 2.2 0.9
Selling, general and administrative expenses 0.1 0.2 0.3 0.3
Other operating expense - net 0.7 0.3 0.9 0.5
Income tax effect 0.0 (0.1) 0.0 (0.2)
Net income (loss) attributable to Century stockholders 2.2 0.9 3.4 1.5
Reclassification out of accumulated other comprehensive income | Unrealized gain (loss) on financial instruments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold (0.0) (0.1) (0.1) (0.1)
Income tax effect 0.0 0.0 0.0 0.0
Net income (loss) attributable to Century stockholders $ 0.0 $ (0.1) $ (0.1) $ (0.1)