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Earnings Per Share - Schedule of EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Net income (loss) attributable to Century stockholders $ 246.8 $ (38.6)
Basic EPS:    
Net income (loss) allocated to common stockholders $ 233.6 $ (38.6)
Net loss allocated to common stockholders (in shares) 92.7 92.3
Net loss allocated to common stockholders (in dollars per share) $ 2.52 $ (0.42)
Effect of Dilutive Securities    
Share-based compensation $ (12.7) $ 0.0
Share-based compensation (in shares) 1.4 0.0
Convertible senior notes $ 1.9 $ 0.0
Convertible senior notes (in shares) 4.6 0.0
Diluted EPS:    
Net income (loss) allocated to common stockholders $ 222.8 $ (38.6)
Net loss allocated to common stockholders (in shares) 98.7 92.3
Net loss allocated to common stockholders (in dollars per share) $ 2.26 $ (0.42)