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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Fair Values of Expected Cash Flows of Commodity Options) (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
MMBTU
$ / bbl
$ / MMBTU
bbl
Dec. 31, 2014
USD ($)
Fair Value    
Asset $ 193.4 $ 279.1
Liability [1] (567.4) (440.0)
Commodity Option [Member]    
Fair Value    
Credit valuation adjustments $ (0.4) $ (0.7)
Written [Member] | Portion of Put Option Contracts Maturing in 2015 - Natural Gas [Member]    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU [2] 1,012,000  
Strike Price | $ / MMBTU [3] 3.90  
Market Price | $ / MMBTU [3] 2.60  
Fair Value    
Asset [4]
Liability [4] $ (1.3) $ (3.8)
Written [Member] | Portion of Put Option Contracts Maturing in 2015 - NGL [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 23,000  
Strike Price | $ / bbl [3] 77.28  
Market Price | $ / bbl [3] 39.81  
Fair Value    
Asset [4]
Liability [4] $ (0.9)
Written [Member] | Portion of Call Option Contracts Maturing in 2015 - Natural Gas [Member]    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU [2] 322,000  
Strike Price | $ / MMBTU [3] 5.05  
Market Price | $ / MMBTU [3] 2.60  
Fair Value    
Asset [4]
Liability [4]
Written [Member] | Portion of Call Option Contracts Maturing in 2015 - NGL [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 372,600  
Strike Price | $ / bbl [3] 45.80  
Market Price | $ / bbl [3] 23.58  
Fair Value    
Asset [4]
Liability [4] $ (0.6)
Written [Member] | Portion of Call Option Contracts Maturing in 2015 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 184,000  
Strike Price | $ / bbl [3] 88.39  
Market Price | $ / bbl [3] 45.77  
Fair Value    
Asset [4]
Liability [4] $ (0.4)
Written [Member] | Portion of Put Option Contracts Maturing in 2016 - Natural Gas [Member]    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU [2] 1,647,000  
Strike Price | $ / MMBTU [3] 3.75  
Market Price | $ / MMBTU [3] 2.80  
Fair Value    
Asset [4]
Liability [4] $ (1.7) $ (1.0)
Written [Member] | Portion of Put Option Contracts Maturing in 2016 - NGL [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 91,500  
Strike Price | $ / bbl [3] 39.06  
Market Price | $ / bbl [3] 25.26  
Fair Value    
Asset [4]
Liability [4] $ (1.3)
Written [Member] | Portion of Call Option Contracts Maturing in 2016 - Natural Gas [Member]    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU [2] 1,647,000  
Strike Price | $ / MMBTU [3] 4.98  
Market Price | $ / MMBTU [3] 2.80  
Fair Value    
Asset [4]
Liability [4] $ (0.1)
Written [Member] | Portion of Call Option Contracts Maturing in 2016 - NGL [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 2,836,500  
Strike Price | $ / bbl [3] 45.14  
Market Price | $ / bbl [3] 22.88  
Fair Value    
Asset [4]
Liability [4] $ (1.2) $ (3.2)
Written [Member] | Portion of Call Option Contracts Maturing in 2016 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 805,200  
Strike Price | $ / bbl [3] 86.68  
Market Price | $ / bbl [3] 49.23  
Fair Value    
Asset [4]
Liability [4] $ (0.2) $ (2.7)
Written [Member] | Portion of Call Option Contracts Maturing in 2017 - NGL [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 1,277,500  
Strike Price | $ / bbl [3] 29.46  
Market Price | $ / bbl [3] 24.76  
Fair Value    
Asset [4]
Liability [4] $ (3.0) $ (0.7)
Written [Member] | Portion of Call Option Contracts Maturing in 2017 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 547,500  
Strike Price | $ / bbl [3] 71.45  
Market Price | $ / bbl [3] 52.74  
Fair Value    
Asset [4]
Liability [4] $ (1.1) $ (3.3)
Purchased [Member] | Portion of Put Option Contracts Maturing in 2015 - Natural Gas [Member]    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU [2] 1,012,000  
Strike Price | $ / MMBTU [3] 3.90  
Market Price | $ / MMBTU [3] 2.60  
Fair Value    
Asset [4] $ 1.3 $ 3.8
Liability [4]
Purchased [Member] | Portion of Put Option Contracts Maturing in 2015 - NGL [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 579,600  
Strike Price | $ / bbl [3] 43.32  
Market Price | $ / bbl [3] 23.75  
Fair Value    
Asset [4] $ 11.4 $ 40.2
Liability [4]
Purchased [Member] | Portion of Put Option Contracts Maturing in 2015 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 184,000  
Strike Price | $ / bbl [3] 81.56  
Market Price | $ / bbl [3] 45.77  
Fair Value    
Asset [4] $ 6.6 $ 18.8
Liability [4]
Purchased [Member] | Portion of Call Option Contracts Maturing in 2015 - Natural Gas [Member]    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU [2] 322,000  
Strike Price | $ / MMBTU [3] 5.05  
Market Price | $ / MMBTU [3] 2.60  
Fair Value    
Asset [4]
Liability [4]
Purchased [Member] | Portion of Put Option Contracts Maturing in 2016 - Natural Gas [Member]    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU [2] 1,647,000  
Strike Price | $ / MMBTU [3] 3.75  
Market Price | $ / MMBTU [3] 2.80  
Fair Value    
Asset [4] $ 1.7 $ 1.0
Liability [4]
Purchased [Member] | Portion of Put Option Contracts Maturing in 2016 - NGL [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 2,836,500  
Strike Price | $ / bbl [3] 39.24  
Market Price | $ / bbl [3] 22.88  
Fair Value    
Asset [4] $ 48.4 $ 39.3
Liability [4]
Purchased [Member] | Portion of Put Option Contracts Maturing in 2016 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 805,200  
Strike Price | $ / bbl [3] 75.91  
Market Price | $ / bbl [3] 49.23  
Fair Value    
Asset [4] $ 21.8 $ 14.7
Liability [4]
Purchased [Member] | Portion of Call Option Contracts Maturing in 2016 - Natural Gas [Member]    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU [2] 1,647,000  
Strike Price | $ / MMBTU [3] 4.98  
Market Price | $ / MMBTU [3] 2.80  
Fair Value    
Asset [4] $ 0.1
Liability [4]
Purchased [Member] | Portion of Call Option Contracts Maturing in 2016 - NGL [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 91,500  
Strike Price | $ / bbl [3] 46.41  
Market Price | $ / bbl [3] 25.26  
Fair Value    
Asset [4]
Liability [4]
Purchased [Member] | Portion of Put Option Contracts Maturing in 2017 - NGL [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 1,277,500  
Strike Price | $ / bbl [3] 25.26  
Market Price | $ / bbl [3] 24.76  
Fair Value    
Asset [4] $ 5.5 $ 1.2
Liability [4]
Purchased [Member] | Portion of Put Option Contracts Maturing in 2017 - Crude Oil [Member]    
Derivative [Line Items]    
Notional (Bbl) | bbl [2] 547,500  
Strike Price | $ / bbl [3] 63.00  
Market Price | $ / bbl [3] 52.74  
Fair Value    
Asset [4] $ 7.5 $ 4.1
Liability [4]
[1] Includes $16.2 million and $28.4 million of cash collateral at September 30, 2015 and December 31, 2014, respectively.
[2] Volumes of natural gas are measured in MMBtu, whereas volumes of NGL and crude oil are measured in Bbl.
[3] Strike and market prices are in $/MMBtu for natural gas and in $/Bbl for NGL and crude oil.
[4] The fair value is determined based on quoted market prices at September 30, 2015 and December 31, 2014, respectively, discounted using the swap rate for the respective periods to consider the time value of money. Fair values exclude credit valuation adjustment losses of approximately $0.4 million and $0.7 million at September 30, 2015 and December 31, 2014, respectively, as well as cash collateral received.