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Supplemental Guarantor/Non-Guarantor Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Audited Supplemental Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 1,440.8 | $ 1,207.1 | $ 1,040.2 | $ 1,027.2 | $ 1,313.1 |  |  |  | $ 1,418.9 | $ 1,339.3 | $ 1,537.9 | $ 3,564.7 | $ 4,715.3 | $ 5,609.2 | $ 6,792.2
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses (exclusive of items shown separately below) |  |  |  |  |  |  |  |  |  |  |  | 3,035.9 | 4,107.6 | 5,007.7 | 5,716.9
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  |  | 336.7 | 465.4 | 572.2 | 655.7
Asset retirement obligation expenses |  |  |  |  |  |  |  |  |  |  |  | 26.9 | 41.8 | 45.5 | 81.0
Selling and administrative expenses |  |  |  |  |  |  |  |  |  |  |  | 90.7 | 153.4 | 176.4 | 227.1
Restructuring and pension settlement charges |  |  |  |  |  |  | $ 21.2 |  |  |  |  |  | 15.5 | 23.5 | 26.0
Other operating (income) loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on disposal of assets |  |  | (13.7) |  |  |  |  |  |  |  |  | 21.4 | (23.2) | (45.0) | (41.4)
Asset impairment | 230.7 |  |  | 17.2 | 377.0 |  | 900.8 |  |  |  |  | 230.7 | 247.9 | 1,277.8 | 154.4
Loss from equity affiliates and investment in subsidiaries | (28.8) |  |  |  |  |  |  |  |  |  |  | 26.2 | (16.2) | 15.9 | 107.6
Interest expense |  |  |  | 126.2 |  |  |  |  |  |  |  | 150.4 | 298.6 | 465.4 | 426.6
Loss on early debt extinguishment | (29.5) |  |  |  |  |  | 8.3 | $ 59.5 |  |  |  | (29.5) | 29.5 | 67.8 | 1.6
Interest income |  |  |  |  |  |  |  |  |  |  |  | (4.0) | (5.7) | (7.7) | (15.4)
Reorganization Items | 33.9 | 29.7 | 95.4 |  |  |  |  |  |  |  |  | 159.0 | 159.0 | 0.0 | 0.0
(Loss) income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  | (446.3) | (758.3) | (1,990.3) | (547.9)
Income tax (benefit) provision |  |  |  |  | 7.9 |  | $ 67.4 |  |  |  |  | (6.2) | (84.0) | (176.4) | 201.2
(Loss) income from continuing operations, net of income taxes | (186.2) | (95.6) | (230.8) | (161.7) | (497.9) |  |  |  | (144.4) | (1,007.2) | (164.4) | (440.1) | (674.3) | (1,813.9) | (749.1)
Loss from discontinued operations, net of income taxes | 13.1 | 38.1 |  |  |  | $ 155.1 |  | $ 7.6 |  |  |  | (53.6) | (57.6) | (175.0) | (28.2)
Net (loss) income | (199.3) | (133.7) | (233.8) | (165.1) | (470.2) |  |  |  | (301.9) | (1,043.5) | (173.3) | (493.7) | (731.9) | (1,988.9) | (777.3)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  | 7.9 | 7.9 | 7.1 | 9.7
Net (loss) income attributable to common stockholders | $ (203.7) | $ (135.5) | $ (235.5) | $ (165.1) | $ (469.4) |  |  |  | $ (304.7) | $ (1,045.3) | $ (176.6) | $ (501.6) | (739.8) | (1,996.0) | (787.0)
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Audited Supplemental Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses (exclusive of items shown separately below) |  |  |  |  |  |  |  |  |  |  |  |  | 172.9 | 436.6 | 49.6
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Asset retirement obligation expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 12.8 | 32.1 | 46.8
Restructuring and pension settlement charges |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (3.9) | 0.0
Other operating (income) loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (2.3) | 0.0
Asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 4.7
Loss from equity affiliates and investment in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 185.0 | 933.9 | 128.5
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 288.6 | 468.4 | 423.1
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  |  |  |  | 29.5 | 67.8 | 1.6
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | (0.2) | (14.0) | (15.3)
Reorganization Items |  |  |  |  |  |  |  |  |  |  |  |  | 73.4 |  |
(Loss) income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | (762.0) | (1,918.6) | (639.0)
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  |  |  |  | (84.6) | (87.4) | 116.4
(Loss) income from continuing operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  | (677.4) | (1,831.2) | (755.4)
Loss from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  | (62.4) | (164.8) | (31.6)
Net (loss) income |  |  |  |  |  |  |  |  |  |  |  |  | (739.8) | (1,996.0) | (787.0)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net (loss) income attributable to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  | (739.8) | (1,996.0) | (787.0)
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Audited Supplemental Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 2,830.0 | 3,535.3 | 4,063.8
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses (exclusive of items shown separately below) |  |  |  |  |  |  |  |  |  |  |  |  | 2,172.4 | 2,782.6 | 3,121.9
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 217.4 | 249.7 | 271.0
Asset retirement obligation expenses |  |  |  |  |  |  |  |  |  |  |  |  | 15.8 | 13.2 | 23.2
Selling and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 126.5 | 132.6 | 161.1
Restructuring and pension settlement charges |  |  |  |  |  |  |  |  |  |  |  |  | 11.9 | 11.4 | 26.0
Other operating (income) loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  | (21.4) | (29.8) | (17.7)
Asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | 37.5 | 308.6 | 63.3
Loss from equity affiliates and investment in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 4.5 | 6.9 | 7.6
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 19.6 | 19.6 | 19.5
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | (4.8) | (2.4) | (2.9)
Reorganization Items |  |  |  |  |  |  |  |  |  |  |  |  | 82.1 |  |
(Loss) income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 168.5 | 42.9 | 390.8
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  |  |  |  | (11.0) | (108.2) | 23.7
(Loss) income from continuing operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 179.5 | 151.1 | 367.1
Loss from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  | (0.1) | 1.6 | (7.2)
Net (loss) income |  |  |  |  |  |  |  |  |  |  |  |  | 179.4 | 152.7 | 359.9
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.8 | 5.2
Net (loss) income attributable to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 179.4 | 151.9 | 354.7
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Audited Supplemental Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 2,189.8 | 2,535.3 | 3,311.7
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses (exclusive of items shown separately below) |  |  |  |  |  |  |  |  |  |  |  |  | 2,066.8 | 2,249.9 | 3,128.7
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 248.0 | 322.5 | 384.7
Asset retirement obligation expenses |  |  |  |  |  |  |  |  |  |  |  |  | 26.0 | 32.3 | 57.8
Selling and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 14.1 | 11.7 | 19.2
Restructuring and pension settlement charges |  |  |  |  |  |  |  |  |  |  |  |  | 3.6 | 16.0 | 0.0
Other operating (income) loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  | (1.8) | (12.9) | (23.7)
Asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | 210.4 | 969.2 | 86.4
Loss from equity affiliates and investment in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | (20.7) | 9.0 | 100.0
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 24.4 | 24.7 | 34.3
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | (34.7) | (38.6) | (47.5)
Reorganization Items |  |  |  |  |  |  |  |  |  |  |  |  | 3.5 |  |
(Loss) income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | (349.8) | (1,048.5) | (428.2)
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  |  |  |  | 11.6 | 19.2 | 61.1
(Loss) income from continuing operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  | (361.4) | (1,067.7) | (489.3)
Loss from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 4.9 | (11.8) | 10.6
Net (loss) income |  |  |  |  |  |  |  |  |  |  |  |  | (356.5) | (1,079.5) | (478.7)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | 7.9 | 6.3 | 4.5
Net (loss) income attributable to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  | (364.4) | (1,085.8) | (483.2)
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Audited Supplemental Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | (304.5) | (461.4) | (583.3)
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses (exclusive of items shown separately below) |  |  |  |  |  |  |  |  |  |  |  |  | (304.5) | (461.4) | (583.3)
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Asset retirement obligation expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Restructuring and pension settlement charges |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other operating (income) loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Loss from equity affiliates and investment in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | (185.0) | (933.9) | (128.5)
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (34.0) | (47.3) | (50.3)
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 34.0 | 47.3 | 50.3
Reorganization Items |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
(Loss) income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 185.0 | 933.9 | 128.5
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
(Loss) income from continuing operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 185.0 | 933.9 | 128.5
Loss from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net (loss) income |  |  |  |  |  |  |  |  |  |  |  |  | 185.0 | 933.9 | 128.5
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net (loss) income attributable to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 185.0 | $ 933.9 | $ 128.5

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