v3.3.0.814
EMPLOYEE RETIREMENT PLANS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2016
Sep. 01, 2015
Dec. 31, 2014
OPEB Benefits              
Defined Contribution Plan Disclosure [Line Items]              
Changes in OPEB benefit obligation     $ (29.8)        
Discount rate           3.59% 3.90%
Increase (decrease) in service cost due to remeasurement     (0.2)        
Increase (decrease) in interest cost due to remeasurement     $ (0.2)        
Defined benefit plan weighted average rates, service cost     3.59%        
Defined benefit plan weighted average rates, interest cost     3.59%        
OPEB Benefits | Minimum              
Defined Contribution Plan Disclosure [Line Items]              
Spot rate for service cost     0.65%        
Spot rate for interest cost     0.65%        
OPEB Benefits | Maximum              
Defined Contribution Plan Disclosure [Line Items]              
Spot rate for service cost     5.01%        
Spot rate for interest cost     5.01%        
OPEB Benefits | Estimated              
Defined Contribution Plan Disclosure [Line Items]              
Estimated increase (decrease) in service cost         $ (7.0)    
Estimated increase (decrease) in interest cost         $ (7.0)    
U.S. Pension Plans              
Defined Contribution Plan Disclosure [Line Items]              
Expense related to the defined contribution plans $ 3.6 $ 3.4 $ 10.9 $ 10.8