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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Comprehensive (loss) income:        
Net (loss) income $ (9.1) $ (6.7) $ 16.6 $ 238.0
Other comprehensive income (loss) before income tax effect:        
Net loss on foreign currency cash flow hedges reclassified as income (0.1) 0.0 (0.1) (0.1)
Defined benefit plans and other postretirement benefits:        
Net loss arising during the period 0.0 0.0 0.0 (3.4)
Amortization of prior service (cost) benefit during the period 0.0 (0.1) 0.1 0.0
Amortization of net loss during the period 1.6 1.6 3.2 3.3
Other comprehensive income (loss) before income tax effect 1.5 1.5 3.2 (0.2)
Income tax effect 0.0 0.0 0.0 0.0
Other comprehensive income (loss) 1.5 1.5 3.2 (0.2)
Comprehensive (loss) income (7.6) (5.2) 19.8 237.8
Comprehensive loss attributable to noncontrolling interests (4.5) (4.2) (8.5) (6.3)
Comprehensive (loss) income attributable to Century stockholders $ (3.1) $ (1.0) $ 28.3 $ 244.1