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OTHER ASSETS (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 05, 2015
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Other Assets [Abstract]        
Investments in non-consolidated affiliates   $ 27.2 $ 25.2 $ 26.7
Deferred debt issuance costs   3.0 3.1 2.6
Tax-Related Receivable, Noncurrent   16.1 14.4 17.5
Interest rate swaps   8.3 0.0 7.7
Supply Contracts   560.4 402.2 566.7
Other   22.2 18.9 23.2
Other assets   637.2 463.8 644.4
Business Combination, Separately Recognized Transactions [Line Items]        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Ethylene Asset $ 416.1      
2017 Supply Contract Payment   209.4    
Payments under long-term supply contract       $ (175.7)
Amortization of Supply Contracts   6.3 $ 4.3  
Minimum        
Business Combination, Separately Recognized Transactions [Line Items]        
2020 Supply Contract Payment   425.0    
Maximum        
Business Combination, Separately Recognized Transactions [Line Items]        
2020 Supply Contract Payment   $ 465.0    
DCP Business        
Business Combination, Separately Recognized Transactions [Line Items]        
Payments for Supply of Ethylene $ 433.5