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PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Pension Benefits    
Components of Net Periodic Benefit Costs:    
Service cost $ 1.0 $ 0.9
Interest cost 2.4 2.4
Expected return on plan assets (3.3) (3.5)
Amortization of net loss 1.3 1.6
Amortization of prior service cost (0.6) (0.6)
Net periodic benefit cost 0.8 0.8
Defined Benefit Pension Plan Contributions    
Employer contribution 3.1  
Full year expected cash contributions to pension plan 7.5  
Post-retirement Benefits    
Components of Net Periodic Benefit Costs:    
Service cost 0.4 0.4
Interest cost 0.7 0.6
Amortization of net loss 0.3 0.6
Net periodic benefit cost $ 1.4 $ 1.6