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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Changes in accumulated other comprehensive income (loss) by component, net of taxes      
Balance at the beginning of the period $ 1,667.4 $ 961.2 $ 805.7
Amortization of prior service cost (3.5) (4.6) (4.7)
Amortization of net loss (gain) 27.3 25.0 (9.4)
Other adjustments 0.2 (0.5) 0.2
Balance at the end of the period 2,296.9 1,667.4 961.2
Comprehensive Income (Loss):      
Tax benefit (expense) on other comprehensive income (loss) (9.3) (8.1) 4.2
Pensions      
Changes in accumulated other comprehensive income (loss) by component, net of taxes      
Balance at the beginning of the period (39.1) (61.7)  
Amortization of prior service cost (0.8) (1.7)  
Amortization of net loss (gain) 14.1 24.3  
Balance at the end of the period (25.8) (39.1) (61.7)
Post Retirement      
Changes in accumulated other comprehensive income (loss) by component, net of taxes      
Balance at the beginning of the period 10.1 12.2  
Amortization of prior service cost (2.7) (2.8)  
Amortization of net loss (gain) 11.3 0.7  
Balance at the end of the period 18.7 10.1 12.2
Non-Qualified Plans      
Changes in accumulated other comprehensive income (loss) by component, net of taxes      
Balance at the beginning of the period (0.7) (0.6)  
Amortization of prior service cost   (0.1)  
Amortization of net loss (gain) 0.8    
Balance at the end of the period 0.1 (0.7) (0.6)
Other      
Changes in accumulated other comprehensive income (loss) by component, net of taxes      
Balance at the beginning of the period (1.2) (0.7)  
Amortization of net loss (gain) 1.1    
Foreign currency exchange (0.4) (0.9)  
Other adjustments 0.6 0.4  
Balance at the end of the period 0.1 (1.2) (0.7)
Accumulated Other Comprehensive Income (Loss)      
Changes in accumulated other comprehensive income (loss) by component, net of taxes      
Balance at the beginning of the period (30.9) (50.8) (36.9)
Amortization of prior service cost (3.5) (4.6)  
Amortization of net loss (gain) 27.3 25.0  
Foreign currency exchange (0.4) (0.9)  
Other adjustments 0.6 0.4  
Balance at the end of the period $ (6.9) $ (30.9) $ (50.8)