Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details)

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DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total Face Amount $ 3,131.7 $ 3,448.2
Letters of credit outstanding 112.8 186.3
Long-term Debt 2,489.7 2,699.4
Debt, Long-term and Short-term, Combined Amount 2,507.2  
Long-term Debt, Current Maturities $ 17.5  
$700 Million 4.875% 2021 Senior Note [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.875%  
Debt Instrument, Face Amount Exchanged $ 76.3  
Total Face Amount 336.2 [1],[2],[3],[4],[5],[6],[7],[8],[9] 412.5
Unamortized Debt Issuance Expense (1.3) [1],[2],[3],[4],[5],[6],[7],[8],[9] (1.7)
Long-term Debt 334.7 [1],[2],[3],[4],[5],[6],[7],[8],[9] 410.6
Debt Instrument, Unamortized Discount $ (0.2) [1],[2],[3],[4],[5],[6],[7],[8],[9] $ (0.2)
Imputed interest rate 4.89% [1],[2],[3],[4],[5],[6],[7],[8],[9] 4.89%
$500 million 4.80% 2020 Senior Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.80%  
Debt Instrument, Face Amount Exchanged $ 44.7  
Total Face Amount 249.3 $ 306.7
Unamortized Debt Issuance Expense (0.8) (1.1)
Long-term Debt 248.3 305.2
Debt Instrument, Unamortized Discount $ (0.2) $ (0.4)
Imputed interest rate 4.83% 4.83%
$800 Million 6.25% 2040 Senior Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 6.25%  
Debt Instrument, Face Amount Exchanged $ 194.4  
Total Face Amount 298.4 $ 492.8
Unamortized Debt Issuance Expense (2.5) (4.3)
Long-term Debt 292.4 482.7
Debt Instrument, Unamortized Discount $ (3.5) $ (5.8)
Imputed interest rate 6.34% 6.34%
$400 Million 5.90% 2020 Senior Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 5.90%  
Debt Instrument, Face Amount Exchanged $ 65.1  
Total Face Amount 225.6 $ 290.8
Unamortized Debt Issuance Expense (0.7) (1.1)
Long-term Debt 224.3 288.9
Debt Instrument, Unamortized Discount $ (0.6) $ (0.8)
Imputed interest rate 5.98% 5.98%
$500 Million 3.95% 2018 Senior Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 3.95%  
Debt Instrument, Face Amount Exchanged $ 17.6  
Total Face Amount 283.6 $ 311.2
Unamortized Debt Issuance Expense (0.6) (0.9)
Long-term Debt 282.2 309.1
Debt Instrument, Unamortized Discount $ (0.8) $ (1.2)
Imputed interest rate 6.15% 6.30%
Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 8.25%  
Total Face Amount $ 540.0 $ 540.0
Unamortized Debt Issuance Expense (9.2) (10.5)
Long-term Debt 501.8 497.4
Debt Instrument, Unamortized Discount $ (29.0) $ (32.1)
Imputed interest rate 9.97% 9.97%
Two hundred Eighteen Point Five Million Eight Point Zero Twenty Twenty One Point Five Lien Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 8.00%  
Debt Instrument, Carrying Amount Received in Debt Exchange of $544.2M 7.75% Notes $ 76.3  
Debt Instrument, Face Amount Received in Debt Exchange of $544M 7.75% Notes 57.0  
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes 11.4  
Debt Instrument, Carrying Amount Received in Debt Exchange of $500M 3.95% Notes 15.3  
Debt Instrument, Carrying Amount Received in Debt Exchange of $400M 5.90% Notes 34.9  
Debt Instrument, Carrying Value Received in Debt Exchange of $800M 6.25% Notes 101.5  
Debt Instrument, Carrying Value Received in Debt Exchange of $500M 4.80% Notes 23.9  
Debt instrument, Carrying Value Received in Debt Exchange of $700M 4.875% Notes 40.9  
Debt Instrument, Face Amount Received in Debt Exchange of $400M 5.90% Notes 26.0  
Debt Instrument, Face Amount Received in Debt Exchange of $800M 6.25% Notes 75.8  
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes 17.9  
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes 30.5  
Total Face Amount 218.5  
Debt Instrument, Par Value 218.5  
Unamortized Debt Issuance Expense 0.0  
Undiscounted interest 74.3  
Long-term Debt $ 292.8  
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 7.75%  
Debt Instrument, Face Amount Exchanged $ 114.1  
Total Face Amount 430.1 $ 544.2
Unamortized Debt Issuance Expense (6.6) (9.5)
Long-term Debt 328.6 403.2
Debt Instrument, Unamortized Discount $ (94.9) $ (131.5)
Imputed interest rate 15.55% 15.55%
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Par Value $ 550.0 $ 550.0
Credit facility, amount outstanding [2] 0.0  
Line of Credit Facility, Maximum Borrowing Capacity 425.6 366.0
Letters of credit outstanding 112.8  
Credit facility remaining capacity 312.8 179.2
Letter of Credit [Member]    
Debt Instrument [Line Items]    
Credit facility, amount outstanding   186.3
Hedge Obligations [Member]    
Debt Instrument [Line Items]    
Credit facility, amount outstanding   0.5
Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Fair Value Adjustment to Interest Rate Hedge $ 2.1 $ 2.3
[1] As of December 31, 2015, no loans were drawn under the ABL Facility and we had total availability of $366.0 million as a result of borrowing base limitations. As of December 31, 2015, the principal amount of letter of credit obligations totaled $186.3 million and commodity hedge obligations totaled $0.5 million, thereby further reducing available borrowing capacity on our ABL Facility to $179.2 million.
[2] As of June 30, 2016, no loans were drawn under the ABL Facility and we had total availability of $425.6 million as a result of borrowing base limitations. As of June 30, 2016, the principal amount of letter of credit obligations totaled $112.8 million, thereby further reducing available borrowing capacity on our ABL Facility to $312.8 million.
[3] On March 2, 2016, we exchanged as part of an exchange offer $114.1 million of the 7.75 percent senior notes for $57.0 million of the 8.00 percent 1.5 lien notes that are recorded at a carrying value of $76.3 million, including undiscounted interest payments as of June 30, 2016.
[4] On March 2, 2016, we exchanged as part of an exchange offer $17.6 million of the 3.95 percent senior notes for $11.4 million of the 8.00 percent 1.5 lien notes that are recorded at a carrying value of $15.3 million, including undiscounted interest payments as of June 30, 2016. Additionally, during the first quarter of 2016 we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction.
[5] On March 2, 2016, we exchanged as part of an exchange offer $194.4 million of the 6.25 percent senior notes for $75.8 million of the 8.00 percent 1.5 lien notes that are recorded at a carrying value of $101.5 million, including undiscounted interest payments as of June 30, 2016.
[6] On March 2, 2016, we exchanged as part of an exchange offer $44.7 million of the 4.80 percent senior notes for $17.9 million of the 8.00 percent 1.5 lien notes that are recorded at a carrying value of $23.9 million, including undiscounted interest payments as of June 30, 2016. Additionally, during the second quarter of 2016 we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction.
[7] On March 2, 2016, we exchanged as part of an exchange offer $65.1 million of the 5.90 percent senior notes for $26.0 million of the 8.00 percent 1.5 lien notes that are recorded at a carrying value of $34.9 million, including undiscounted interest payments as of June 30, 2016.
[8] See the section entitled "$218.5 million 8.00 percent 2020 Senior Secured 1.5 Lien Notes - 2016 Exchange Offers" below for further discussion related to this instrument.
[9] n March 2, 2016, we exchanged as part of an exchange offer $76.3 million of the 4.875 percent senior notes for $30.5 million of the 8.00 percent 1.5 lien notes that are recorded at a carrying value of $40.9 million, including undiscounted interest payments