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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Fair Values of Expected Cash Flows of Commodity Options) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Boe
$ / MillionBarrels-MMBbls
bbl
Dec. 31, 2015
USD ($)
Fair Value    
Asset $ 47.3 $ 163.6
Liability (221.0) (221.5)
Commodity Options [Member]    
Fair Value    
Credit Valuation Adjustments $ 0.1 (0.4)
Purchased [Member] | Portion of Put Option Contracts Maturing in 2017 - NGL [Member]    
Derivative [Line Items]    
Notional (MMBtu) | Boe [1] 1,642,500  
Strike Price | $ / MillionBarrels-MMBbls [2] 25.9  
Market Price | $ / MillionBarrels-MMBbls [2] 35.05  
Fair Value    
Asset [3] $ 3.4 5.8
Liability [3] $ 0.0 0.0
Purchased [Member] | Portion of Put Option Contracts Maturing in 2017 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [1] 638,750  
Strike Price | $ / MillionBarrels-MMBbls [2] 59.86  
Market Price | $ / MillionBarrels-MMBbls [2] 56.35  
Fair Value    
Asset [3] $ 4.6 10.0
Liability [3] $ 0.0 0.0
Purchased [Member] | Portion Of Put Option Contracts Maturing In 2018 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [1] 91,250  
Strike Price | $ / MillionBarrels-MMBbls [2] 42  
Market Price | $ / MillionBarrels-MMBbls [2] 56.52  
Fair Value    
Asset [3] $ 0.2 0.0
Liability [3] $ 0.0 0.0
Written [Member] | Portion of Call Option Contracts Maturing in 2017 - NGL [Member]    
Derivative [Line Items]    
Notional (MMBtu) | Boe [1] 1,642,500  
Strike Price | $ / MillionBarrels-MMBbls [2] 30.06  
Market Price | $ / MillionBarrels-MMBbls [2] 35.05  
Fair Value    
Asset [3] $ 0.0 0.0
Liability [3] $ (13.4) (0.8)
Written [Member] | Portion of Call Option Contracts Maturing in 2017 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [1] 638,750  
Strike Price | $ / MillionBarrels-MMBbls [2] 68.19  
Market Price | $ / MillionBarrels-MMBbls [2] 56.35  
Fair Value    
Asset [3] $ 0.0 0.0
Liability [3] $ (1.1) (0.6)
Written [Member] | Portion Of Call Option Contracts Maturing In 2018 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [1] 91,250  
Strike Price | $ / MillionBarrels-MMBbls [2] 51.75  
Market Price | $ / MillionBarrels-MMBbls [2] 56.52  
Fair Value    
Asset [3] $ 0.0 0.0
Liability [3] $ (0.8) $ 0.0
[1] Volumes of natural gas are measured in MMBtu, whereas volumes of NGL and crude oil are measured in Bbl.
[2] Strike and market prices are in $/MMBtu for natural gas and in $/Bbl for NGL and crude oil.
[3] The fair value is determined based on quoted market prices at December 31, 2016 and 2015, respectively, discounted using the swap rate for the respective periods to consider the time value of money. Fair values exclude credit valuation adjustment gains of approximately $0.1 million and losses of approximately $0.4 million at December 31, 2016 and 2015, respectively, as well as cash collateral received.