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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]        
Net income (loss) attributable to Century stockholders $ 7.5 $ 37.4 $ (31.1) $ 55.1
Less: net income allocated to participating securities 0.4 2.3 0.0 3.3
Basic EPS:        
Net (loss) income allocated to common stockholders $ 7.1 $ 35.1 $ (31.1) $ 51.8
Net (loss) income allocated to common stockholders (in shares) 92.3 91.2 92.3 91.2
Net (loss) income allocated to common stockholders (in dollars per share) $ 0.08 $ 0.38 $ (0.34) $ 0.57
Share-based compensation $ (0.2) $ (0.3) $ 0.0 $ (0.5)
Share-based compensation (in shares) 0.9 1.6 0.0 1.9
Convertible senior notes $ 0.0 $ 0.7 $ 0.0 $ 1.4
Convertible senior notes (in shares) 0.0 4.8 0.0 4.8
Diluted EPS:        
Net (loss) income allocated to common stockholders with assumed conversion $ 6.9 $ 35.5 $ (31.1) $ 52.7
Net (loss) income allocated to common stockholders with assumed conversion (in shares) 93.2 97.6 92.3 97.9
Net (loss) income allocated to common stockholders with assumed conversion (in dollars per share) $ 0.07 $ 0.36 $ (0.34) $ 0.54