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DEBT AND CREDIT FACILITIES (Tables) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Debt Disclosure [Abstract] |  |
Schedule Of Long-Term Debt | The following represents a summary of our long-term debt as of December 31, 2017 and 2016:
($ in Millions)
December 31, 2017
Debt Instrument |  | Annual Effective Interest Rate |  | Total Principal Amount |  | Debt Issuance Costs |  | Unamortized Discounts |  | Total Debt
Senior Secured Notes |  |  |  |  |  |  |  |  |  |
$400 Million 4.875% 2024 Senior Notes |  | 5.00% |  | $ | 400.0 |  |  | $ | (7.1 | ) |  | $ | (2.6 | ) |  | $ | 390.3 |
Unsecured Notes |  |  |  |  |  |  |  |  |  |
$400 Million 5.90% 2020 Senior Notes |  | 5.98% |  | 88.9 |  |  | (0.2 | ) |  | (0.1 | ) |  | 88.6 |
$500 Million 4.80% 2020 Senior Notes |  | 4.83% |  | 122.4 |  |  | (0.3 | ) |  | (0.1 | ) |  | 122.0 |
$700 Million 4.875% 2021 Senior Notes |  | 4.89% |  | 138.4 |  |  | (0.3 | ) |  | (0.1 | ) |  | 138.0 |
$316.25 Million 1.50% 2025 Convertible Senior Notes |  | 6.26% |  | 316.3 |  |  | (6.6 | ) |  | (85.6 | ) |  | 224.1 |
$1.075 Billion 5.75% 2025 Senior Notes |  | 6.01% |  | 1,075.0 |  |  | (11.3 | ) |  | (16.5 | ) |  | 1,047.2 |
$800 Million 6.25% 2040 Senior Notes |  | 6.34% |  | 298.4 |  |  | (2.4 | ) |  | (3.4 | ) |  | 292.6 |
ABL Facility |  | N/A |  | 550.0 |  |  | N/A |  |  | N/A |  |  | — |
Fair Value Adjustment to Interest Rate Hedge |  |  |  |  |  |  |  |  |  | 1.4 |
Long-term debt |  |  |  |  |  |  |  |  |  | $ | 2,304.2 |
($ in Millions)
December 31, 2016
Debt Instrument |  | Annual Effective Interest Rate |  | Total Principal Amount |  | Debt Issuance Costs |  | Undiscounted Interest/(Unamortized Discounts) |  | Total Debt
Senior Secured Notes |  |  |  |  |  |  |  |  |  |
$540 Million 8.25% 2020 First Lien Notes |  | 9.97% |  | $ | 540.0 |  |  | $ | (8.0 | ) |  | $ | (25.7 | ) |  | $ | 506.3 |
$218.5 Million 8.00% 2020 1.5 Lien Notes |  | N/A |  | 218.5 |  |  | — |  |  | 65.7 |  |  | 284.2 |
$544.2 Million 7.75% 2020 Second Lien Notes |  | 15.55% |  | 430.1 |  |  | (5.8 | ) |  | (85.2 | ) |  | 339.1 |
Unsecured Notes |  |  |  |  |  |  |  |  |  |
$400 Million 5.90% 2020 Senior Notes |  | 5.98% |  | 225.6 |  |  | (0.6 | ) |  | (0.5 | ) |  | 224.5 |
$500 Million 4.80% 2020 Senior Notes |  | 4.83% |  | 236.8 |  |  | (0.7 | ) |  | (0.2 | ) |  | 235.9 |
$700 Million 4.875% 2021 Senior Notes |  | 4.89% |  | 309.4 |  |  | (1.0 | ) |  | (0.2 | ) |  | 308.2 |
$800 Million 6.25% 2040 Senior Notes |  | 6.34% |  | 298.4 |  |  | (2.5 | ) |  | (3.4 | ) |  | 292.5 |
ABL Facility |  | N/A |  | 550.0 |  |  | N/A |  |  | N/A |  |  | — |
Fair Value Adjustment to Interest Rate Hedge |  |  |  |  |  |  |  |  |  | 1.9 |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ | 2,192.6 |
Less current portion |  |  |  |  |  |  |  |  |  | 17.5 |
Long-term debt |  |  |  |  |  |  |  |  |  | $ | 2,175.1 |
Interest Payable [Table Text Block] | The following represents a summary of our unsecured senior notes' maturity and interest payable due dates:
Debt Instrument |  | Maturity |  | Interest Payable (until maturity)
$400 Million 5.90% 2020 Senior Notes |  | March 15, 2020 |  | March 15 and September 15
$500 Million 4.80% 2020 Senior Notes |  | October 1, 2020 |  | April 1 and October 1
$700 Million 4.875% 2021 Senior Notes |  | April 1, 2021 |  | April 1 and October 1
$800 Million 6.25% 2040 Senior Notes |  | October 1, 2040 |  | April 1 and October 1
Schedule of Extinguishment of Debt [Table Text Block] | The following is a summary of the debt extinguished during the year ended December 31, 2017 and the respective gain (loss) on extinguishment for the year ended December 31, 2017:
(In Millions)
|  | Year Ended December 31, 2017
|  | Debt Extinguished |  | Gain (Loss) on Extinguishment 1
Secured Notes |  |  |  |
$540 Million 8.25% 2020 First Lien Notes |  | $ | 540.0 |  |  | $ | (93.5 | )
$218.5 Million 8.00% 2020 1.5 Lien Notes |  | 218.5 |  |  | 45.1 |
$544.2 Million 7.75% 2020 Second Lien Notes |  | 430.1 |  |  | (104.5 | )
Unsecured Notes |  |  |  |
$400 Million 5.90% 2020 Senior Notes |  | 136.7 |  |  | (7.8 | )
$500 Million 4.80% 2020 Senior Notes |  | 114.4 |  |  | (1.9 | )
$700 Million 4.875% 2021 Senior Notes |  | 171.0 |  |  | (2.8 | )
|  | $ | 1,610.7 |  |  | $ | (165.4 | )
1 T his includes premiums paid related to the redemption of our notes of $110.0 million.
$218.5 1.5 Lien Notes Exchange [Table Text Block] |  | The following is a summary of the debt exchanged for our $218.5 million 8.00% 2020 1.5 Lien Notes:
($ In Millions)
|  | Debt Extinguished |  | 1.5 Lien Amount Issued |  | Carrying Value 1 |  | Gain on Restructuring 2
$544.2 Million 7.75% 2020 Second Lien Notes |  | $ | 114.1 |  |  | $ | 57.0 |  |  | $ | 77.5 |  |  | $ | 6.9 |
$500 Million 3.95% 2018 Senior Notes |  | 17.6 |  |  | 11.4 |  |  | 15.5 |  |  | 1.8 |
$400 Million 5.90% 2020 Senior Notes |  | 65.1 |  |  | 26.0 |  |  | 35.4 |  |  | 28.3 |
$500 Million 4.80% 2020 Senior Notes |  | 44.7 |  |  | 17.9 |  |  | 24.4 |  |  | 19.5 |
$700 Million 4.875% 2021 Senior Notes |  | 76.3 |  |  | 30.5 |  |  | 41.5 |  |  | 33.3 |
$800 Million 6.25% 2040 Senior Notes |  | 194.4 |  |  | 75.7 |  |  | 103.0 |  |  | 84.5 |
|  | $ | 512.2 |  |  | $ | 218.5 |  |  | $ | 297.3 |  |  | $ | 174.3 |
1 Includes undiscounted interest payments
2 Net of amounts expensed for unamortized original issue discount and deferred origination fees
Schedule of Maturities of Long-term Debt [Table Text Block] | The following represents a summary of our maturities of debt instruments, excluding borrowings on the ABL Facility, based on the principal amounts outstanding at December 31, 2017:
| (In Millions)
| Maturities of Debt
2018 | $ | — |
2019 | — |
2020 | 211.3 |
2021 | 138.4 |
2022 | — |
2023 and thereafter | 2,089.7 |
Total maturities of debt | $ | 2,439.4 |

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