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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Comprehensive income (loss):    
Net income (loss) $ 244.7 $ (38.6)
Other comprehensive (loss) income before income tax effect:    
Net loss on foreign currency cash flow hedges reclassified as income (0.1) (0.1)
Defined benefit plans and other postretirement benefits:    
Net loss arising during the period (3.4) 0.0
Amortization of prior service cost during the period 0.1 0.0
Amortization of net gain during the period 1.7 1.2
Other comprehensive (loss) income before income tax effect (1.7) 1.1
Income tax effect 0.0 0.0
Other comprehensive (loss) income (1.7) 1.1
Comprehensive income (loss) 243.0 (37.5)
Comprehensive loss attributable to noncontrolling interests (2.1) 0.0
Comprehensive income (loss) attributable to Century stockholders $ 245.1 $ (37.5)