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PENSION AND POST-RETIREMENT PLANS - AMOUNTS INCLUDED IN FINANCIAL STATEMENTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee benefit plans      
Current liabilities $ (3.0) $ (3.0)  
Non-current liabilities, net (79.4) (75.1)  
Pension Benefits      
Employee benefit plans      
Benefit obligation 217.4 232.1 $ 225.4
Fair value of plan assets at end of year 162.2 186.7 178.8
Pension Benefits | Qualified Plan      
Employee benefit plans      
Non-current assets 0.8 0.5  
Non-current liabilities, net (56.0) (45.9)  
Total (55.2) (45.4)  
Net loss, net of taxes (61.8) (46.9)  
Prior service credit, net of taxes 6.0 6.3  
Total (55.8) (40.6)  
Benefit obligation 215.9 229.9  
Accumulated benefit obligation 215.6 229.6  
Fair value of plan assets at end of year 159.9 184.7  
Estimated net loss and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2018 2.2    
Pension Benefits | Nonqualified Plan      
Employee benefit plans      
Current liabilities (1.8) (1.8)  
Non-current liabilities, net (2.4) (2.7)  
Total (4.2) (4.5)  
Net loss, net of taxes (0.4) (0.6)  
Prior service credit, net of taxes 0.3 0.3  
Total (0.1) (0.3)  
Post-retirement Benefits      
Employee benefit plans      
Benefit obligation 22.2 27.7 $ 25.2
Estimated net loss and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2018 $ 2.8    
Amortization period of unrecognized gains and losses 5 years    
Post-retirement Benefits | Qualified Plan      
Employee benefit plans      
Current liabilities $ (1.2) (1.2)  
Non-current liabilities, net (21.0) (26.5)  
Total (22.2) (27.7)  
Net loss, net of taxes (0.1) (4.6)  
Prior service credit, net of taxes 21.8 20.2  
Total $ 21.7 $ 15.6