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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Net income (loss) attributable to Century stockholders $ (2.5) $ 7.5 $ 244.3 $ (31.1)
Less: net income allocated to participating securities 0.0 0.4 13.0 0.0
Basic EPS:        
Net income (loss) allocated to common stockholders $ (2.5) $ 7.1 $ 231.3 $ (31.1)
Net income (loss) allocated to common stockholders (in shares) 92.7 92.3 92.7 92.3
Net income (loss) allocated to common stockholders (in dollars per share) $ (0.03) $ 0.08 $ 2.50 $ (0.34)
Effect of Dilutive Securities        
Share-based compensation $ 0.0 $ (0.2) $ (12.2) $ 0.0
Share-based compensation (in shares) 0.0 0.9 1.5 0.0
Convertible senior notes $ 0.0 $ 0.0 $ 2.6 $ 0.0
Convertible senior notes (in shares) 0.0 0.0 4.6 0.0
Diluted EPS:        
Net income (loss) allocated to common stockholders $ (2.5) $ 6.9 $ 221.7 $ (31.1)
Net income (loss) allocated to common stockholders (in shares) 92.7 93.2 98.8 92.3
Net income (loss) allocated to common stockholders (in dollars per share) $ (0.03) $ 0.07 $ 2.24 $ (0.34)