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PENSION AND POST-RETIREMENT PLANS - AMOUNTS INCLUDED IN FINANCIAL STATEMENTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee benefit plans      
Non-current liabilities, net $ (43.3) $ (82.0)  
Pension Benefits      
Employee benefit plans      
Projected benefit obligations 249.5 263.1 $ 239.9
Fair value of plan assets at end of year 238.9 212.8 194.8
Pension Benefits | Qualified Plan      
Employee benefit plans      
Non-current assets 1.3 1.0  
Non-current liabilities, net (11.9) (51.3)  
Total (10.6) (50.3)  
Net loss, net of taxes (39.9) (64.2)  
Prior service credit, net of taxes 0.8 2.5  
Total (39.1) (61.7)  
Projected benefit obligations 247.8 261.4  
Accumulated benefit obligation 247.4 260.9  
Fair value of plan assets at end of year 235.8 210.0  
Pension Benefits | Nonqualified Plan      
Employee benefit plans      
Current liabilities (1.8) (1.7)  
Non-current liabilities, net (3.0) (2.6)  
Total (4.8) (4.3)  
Net loss, net of taxes (0.7) (0.8)  
Prior service credit, net of taxes   0.1  
Total (0.7) (0.7)  
Post-retirement benefits      
Employee benefit plans      
Projected benefit obligations $ 29.3 29.1 $ 26.0
Amortization period of unrecognized gains and losses 5 years    
Post-retirement benefits | Qualified Plan      
Employee benefit plans      
Current liabilities $ (0.9) (1.0)  
Non-current liabilities, net (28.4) (28.1)  
Total (29.3) (29.1)  
Net loss, net of taxes (3.7) (4.4)  
Prior service credit, net of taxes 13.9 16.6  
Total $ 10.2 $ 12.2