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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Comprehensive income (loss):        
Net income (loss) $ 6.6 $ 37.4 $ (32.0) $ 55.1
Other comprehensive income before income tax effect:        
Net (loss) income on foreign currency cash flow hedges reclassified as income 0.0 (0.1) (0.1) (0.1)
Defined benefit plans and other postretirement benefits:        
Amortization of prior service benefit (cost) during the period 0.1 (0.5) 0.1 (0.9)
Amortization of net gain during the period 2.1 1.4 3.3 2.5
Other comprehensive income before income tax effect 2.2 0.8 3.3 1.5
Income tax effect 0.0 0.0 0.0 (0.1)
Other comprehensive income 2.2 0.8 3.3 1.4
Comprehensive income (loss) 8.8 38.2 (28.7) 56.5
Comprehensive loss attributable to noncontrolling interests (0.9) 0.0 (0.9) 0.0
Comprehensive income (loss) attributable to Century stockholders $ 9.7 $ 38.2 $ (27.8) $ 56.5