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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Changes in accumulated other comprehensive loss by component, net of taxes            
Balance at the beginning of the period   $ 678.2     $ 678.2  
Net gain in prior service cost     $ 0.1     $ 0.1
Amortization of prior service cost $ (1.1)   (0.3)   (2.4) (0.7)
Amortization of net loss 0.5   1.2   1.8 2.1
Other adjustments (0.3)       (0.1) 0.2
Balance at the end of the period 699.5       699.5  
Pensions            
Changes in accumulated other comprehensive loss by component, net of taxes            
Balance at the beginning of the period (49.3) (40.6) (41.0) $ (41.4) (40.6) (41.4)
Amortization of prior service cost (0.5) (0.4) (0.3) (0.4)    
Amortization of net loss 0.9 0.9 0.8 0.8    
Remeasurement adjustment related to the Tax Act   (9.2)        
Balance at the end of the period (48.9) (49.3) (40.5) (41.0) (48.9) (40.5)
Post Retirement            
Changes in accumulated other comprehensive loss by component, net of taxes            
Balance at the beginning of the period 18.4 15.6 18.2 18.1 15.6 18.1
Amortization of prior service cost (0.5) (0.9)        
Amortization of net loss 0.2 0.3 0.3 0.1    
Remeasurement adjustment related to the Tax Act   3.4        
Balance at the end of the period 18.1 18.4 18.5 18.2 18.1 18.5
Non-Qualified Plans            
Changes in accumulated other comprehensive loss by component, net of taxes            
Balance at the beginning of the period (0.4) (0.3) (0.4) (0.4) (0.3) (0.4)
Amortization of prior service cost (0.1)          
Amortization of net loss 0.1 0.1 0.1      
Remeasurement adjustment related to the Tax Act   (0.2)        
Balance at the end of the period (0.4) (0.4) (0.3) (0.4) (0.4) (0.3)
Other            
Changes in accumulated other comprehensive loss by component, net of taxes            
Balance at the beginning of the period 0.6 0.4 0.3 0.1 0.4 0.1
Net gain in prior service cost     0.1      
Amortization of net loss (0.7)          
Other adjustments (0.3) 0.2   0.2    
Balance at the end of the period (0.4) 0.6 0.4 0.3 (0.4) 0.4
Accumulated Other Comprehensive Income (Loss)            
Changes in accumulated other comprehensive loss by component, net of taxes            
Balance at the beginning of the period (30.7) (24.9) (22.9) (23.6) (24.9) (23.6)
Net gain in prior service cost     0.1      
Amortization of prior service cost (1.1) (1.3) (0.3) (0.4)    
Amortization of net loss 0.5 1.3 1.2 0.9    
Remeasurement adjustment related to the Tax Act   (6.0)        
Other adjustments (0.3) 0.2   0.2    
Balance at the end of the period $ (31.6) $ (30.7) $ (21.9) $ (22.9) $ (31.6) $ (21.9)