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PENSION AND POST-RETIREMENT PLANS - STATUS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits      
Change in Benefit Obligation:      
Benefit obligation at beginning of year $ 249.5 $ 263.1  
Service cost 4.8 4.8 $ 5.1
Interest cost 7.0 6.4 7.9
Actuarial (gain) loss (59.0) (10.7)  
Benefits paid, net of subsidies received (14.1) (13.0)  
Expenses paid (0.8) (1.1)  
Benefit obligation at end of year 187.4 249.5 263.1
Change in Plan Assets:      
Balance at the beginning of the period 238.9 212.8  
Actual return on plan assets (26.7) 31.2  
Employer contribution 9.0 9.0 9.0
Benefits paid, net of subsidies received (14.1) (13.0)  
Expenses paid (0.8) (1.1)  
Balance at the end of the period 206.3 238.9 212.8
Funded Status and Recognized Liability 18.9 (10.6)  
Post-retirement benefits      
Change in Benefit Obligation:      
Benefit obligation at beginning of year 29.3 29.1  
Service cost 0.7 0.7 0.5
Interest cost 0.8 0.7 0.8
Participant contributions 0.7 0.8  
Actuarial (gain) loss (14.2) 0.1  
Benefits paid, net of subsidies received (2.0) (2.1)  
Benefit obligation at end of year 15.3 29.3 $ 29.1
Change in Plan Assets:      
Participant contributions 0.7 0.8  
Employer contribution 1.3 1.3  
Benefits paid, net of subsidies received (2.0) (2.1)  
Funded Status and Recognized Liability (15.3) (29.3)  
Qualified Plan | Pension Benefits      
Change in Benefit Obligation:      
Benefit obligation at beginning of year 247.8    
Benefit obligation at end of year   247.8  
Change in Plan Assets:      
Balance at the beginning of the period $ 235.8    
Balance at the end of the period   $ 235.8