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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income for basic and diluted earnings per share $ 78.0 $ 82.0 $ 225.4 $ 60.8
Shares:        
Weighted average shares outstanding for basic earnings per share (in shares) 131,016 143,421 132,578 144,625
Effect of dilutive securities on weighted average shares:        
Amounts related to employee benefit plans (in shares) 2,798 520 2,655 644
Weighted average shares outstanding for diluted earnings per share (in shares) 133,814 143,941 135,233 145,269