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EARNINGS (LOSS) PER SHARE - Reconciliation of Basic Earnings per Share to Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2023
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Basic earnings (loss) from continuing operations per share:                
Net earnings (loss) $ (79.8) $ (16.1) $ 25.0 $ 8.0 $ 33.0 $ 16.9 $ (31.7) $ 145.9
Net earnings (loss) from continuing operations including impact of dilutive adjustments $ (79.8)     $ 8.0        
Outstanding shares, basic (in shares) 89.2     88.8        
Dilutive effect of employee awards (in shares) 0.0     0.0        
Outstanding shares, diluted (in shares) 89.2     88.8        
Per share amount, basic (in dollars per share) $ (0.89) $ (0.18) $ 0.28 $ 0.09 $ 0.37 $ 0.19 $ (0.36) $ 1.64
Per share amount, diluted (in dollars per share) $ (0.89) (0.18) 0.28 $ 0.09 0.37 0.19 (0.36) 1.64
Basic earnings (loss) from discontinued operations per share:                
Net earnings (loss) $ (21.2)     $ 4.5        
Net earnings (loss) from discontinued operations including impact of dilutive adjustments $ (21.2)     $ 4.5        
Outstanding shares, basic (in shares) 89.2     88.8        
Dilutive effect of employee awards (in shares) 0.0     0.0        
Outstanding shares, diluted (in shares) 89.2     88.8        
Per share amount, basic (in dollars per share) $ (0.24) 0.02 0.07 $ 0.05 0.12 0.14 0.07 0.45
Per share amount, diluted (in dollars per share) $ (0.24) $ 0.02 $ 0.07 $ 0.05 $ 0.12 $ 0.14 $ 0.07 $ 0.45