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Earnings Per Share - Schedule of EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to Century stockholders $ 14.9 $ 47.3 $ 40.0 $ 291.6
Less: net income allocated to participating securities 0.8 2.5 2.0 15.5
Basic EPS:        
Net income allocated to common stockholders $ 14.1 $ 44.8 $ 38.0 $ 276.1
Net income allocated to common stockholders (in shares) 93.3 92.8 93.3 92.7
Net income allocated to common stockholders (in dollars per share) $ 0.15 $ 0.48 $ 0.41 $ 2.98
Effect of Dilutive Securities        
Share-based compensation $ 0.0 $ 0.0 $ 0.0 $ 1.2
Share-based compensation (in shares) 1.3 1.0 1.3 1.5
Convertible senior notes $ 0.7 $ 0.7 $ 0.0 $ 2.7
Convertible senior notes (in shares) 4.6 4.6 0.0 4.6
Diluted EPS:        
Net income allocated to common stockholders $ 14.8 $ 45.5 $ 38.0 $ 280.0
Net income allocated to common stockholders (in shares) 99.2 98.4 94.6 98.8
Net income allocated to common stockholders (in dollars per share) $ 0.15 $ 0.46 $ 0.40 $ 2.83