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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Comprehensive income (loss):        
Net income (loss) $ (6.7) $ 6.6 $ 238.0 $ (32.0)
Other comprehensive income (loss) before income tax effect:        
Net gain loss on foreign currency cash flow hedges reclassified as income 0.0 0.0 (0.1) (0.1)
Defined benefit plans and other postretirement benefits:        
Net loss arising during the period 0.0 0.0 (3.4) 0.0
Amortization of prior service benefit (cost) during the period (0.1) 0.1 0.0 0.1
Amortization of net gain during the period 1.6 2.1 3.3 3.3
Other comprehensive (loss) income before income tax effect 1.5 2.2 (0.2) 3.3
Income tax effect 0.0 0.0 0.0 0.0
Other comprehensive income (loss) 1.5 2.2 (0.2) 3.3
Comprehensive income (loss) (5.2) 8.8 237.8 (28.7)
Comprehensive loss attributable to noncontrolling interests (4.2) (0.9) (6.3) (0.9)
Comprehensive income (loss) attributable to Century stockholders $ (1.0) $ 9.7 $ 244.1 $ (27.8)