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Earnings Per Share - Schedule of EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net (loss) income attributable to Century stockholders $ (4.6) $ (2.5) $ 25.1 $ 244.3
Less: net income allocated to participating securities 0.0 0.0 1.3 13.0
Basic EPS:        
Net (loss) income allocated to common stockholders $ (4.6) $ (2.5) $ 23.8 $ 231.3
Net (loss) income allocated to common stockholders (in shares) 93.3 92.7 93.3 92.7
Net (loss) income allocated to common stockholders (in dollars per share) $ (0.05) $ (0.03) $ 0.26 $ 2.50
Effect of Dilutive Securities        
Share-based compensation $ 0.0 $ 0.0 $ 0.0 $ (12.2)
Share-based compensation (in shares) 0.0 0.0 1.3 1.5
Convertible senior notes $ 0.0 $ 0.0 $ 0.0 $ 2.6
Convertible senior notes (in shares) 0.0 0.0 0.0 4.6
Diluted EPS:        
Net (loss) income allocated to common stockholders $ (4.6) $ (2.5) $ 23.8 $ 221.7
Net (loss) income allocated to common stockholders (in shares) 93.3 92.7 94.6 98.8
Net (loss) income allocated to common stockholders (in dollars per share) $ (0.05) $ (0.03) $ 0.25 $ 2.24