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EARNINGS PER SHARE - BASIC AND DILUTED EARNINGS PER SHARE (Details) - USD ($)
shares in Thousands, $ 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 for basic earnings per share $ 116.3 $ 73.7 $ 228.6 $ 72.9
Net income for diluted earnings per share $ 116.3 $ 73.7 $ 228.6 $ 72.9
Shares:        
Weighted average shares outstanding for basic earnings per share (in shares) 107,731 114,273 108,347 114,409
Effect of dilutive securities on weighted average shares:        
Amounts related to employee benefit plans (in shares) 1,527 1,377 1,705 1,780
Weighted average shares outstanding for diluted earnings per share (in shares) 109,258 115,650 110,052 116,189