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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Comprehensive loss:      
Net loss $ (52.3) $ (14.1) $ (167.1)
Other comprehensive (loss) income before income tax effect:      
Net loss on foreign currency cash flow hedges reclassified as income (0.1) (0.2) (0.1)
Defined benefit plans and other postretirement benefits:      
Net (gain) loss arising during the period (10.1) (5.9) 31.6
OPEB curtailment gain, net 0.0 (8.9) 0.0
Amortization of prior service benefit (cost) during the period 0.1 (1.2) (3.1)
Amortization of net loss during the period 6.2 4.8 8.4
Other comprehensive (loss) income before income tax effect (3.9) (11.4) 36.8
Income tax effect 0.0 (0.3) (0.3)
Other comprehensive (loss) income (3.9) (11.7) 36.5
Comprehensive loss (56.2) (25.8) (130.6)
Comprehensive loss attributable to noncontrolling interests (9.2) 0.0 0.0
Comprehensive loss attributable to Century stockholders $ (47.0) $ (25.8) $ (130.6)