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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Changes in accumulated other comprehensive income (loss) by component, net of taxes                
Balance at the beginning of the period $ 1,172.8 $ 1,028.9 $ 961.2 $ 815.5 $ 800.2 $ 805.7 $ 961.2 $ 805.7
Amortization of prior service cost (1.1)     (1.2)     (3.4) (3.5)
Amortization of net loss (gain) 1.0     0.5     3.5 3.1
Other adjustments (0.1)     0.2     (0.2) (0.6)
Balance at the end of the period 1,344.8 1,172.8 1,028.9 891.8 815.5 800.2 1,344.8 891.8
Pensions                
Changes in accumulated other comprehensive income (loss) by component, net of taxes                
Balance at the beginning of the period (60.6) (61.2) (61.7) (50.6) (51.3) (51.9) (61.7) (51.9)
Amortization of prior service cost (0.5) (0.4) (0.4) (0.4) (0.4) (0.5)    
Amortization of net loss (gain) 1.0 1.0 0.9 0.3 1.1 1.1    
Balance at the end of the period (60.1) (60.6) (61.2) (50.7) (50.6) (51.3) (60.1) (50.7)
Post Retirement                
Changes in accumulated other comprehensive income (loss) by component, net of taxes                
Balance at the beginning of the period 11.3 11.7 12.2 15.2 15.8 16.3 12.2 16.3
Amortization of prior service cost (0.6) (0.7) (0.7) (0.8) (0.7) (0.6)    
Amortization of net loss (gain)   0.3 0.2 0.3 0.1 0.1    
Balance at the end of the period 10.7 11.3 11.7 14.7 15.2 15.8 10.7 14.7
Non-Qualified Plans                
Changes in accumulated other comprehensive income (loss) by component, net of taxes                
Balance at the beginning of the period (0.6) (0.5) (0.6) (0.3) (0.4) (0.4) (0.6) (0.4)
Amortization of prior service cost   (0.1)       (0.1)    
Amortization of net loss (gain)     0.1 (0.1) 0.1 0.1    
Balance at the end of the period (0.6) (0.6) (0.5) (0.4) (0.3) (0.4) (0.6) (0.4)
Other                
Changes in accumulated other comprehensive income (loss) by component, net of taxes                
Balance at the beginning of the period (0.8) (0.9) (0.7) (1.7) (1.6) (0.9) (0.7) (0.9)
Foreign currency exchange (0.1) (0.1) (0.2) 0.1 0.3 (0.5)    
Other adjustments   0.2   0.1 (0.4) (0.2)    
Balance at the end of the period (0.9) (0.8) (0.9) (1.5) (1.7) (1.6) (0.9) (1.5)
Accumulated Other Comprehensive Income (Loss)                
Changes in accumulated other comprehensive income (loss) by component, net of taxes                
Balance at the beginning of the period (50.7) (50.9) (50.8) (37.4) (37.5) (36.9) (50.8) (36.9)
Amortization of prior service cost (1.1) (1.2) (1.1) (1.2) (1.1) (1.2)    
Amortization of net loss (gain) 1.0 1.3 1.2 0.5 1.3 1.3    
Foreign currency exchange (0.1) (0.1) (0.2) 0.1 0.3 (0.5)    
Other adjustments   0.2   0.1 (0.4) (0.2)    
Balance at the end of the period $ (50.9) $ (50.7) $ (50.9) $ (37.9) $ (37.4) $ (37.5) $ (50.9) $ (37.9)