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Supplemental Guarantor/Non-Guarantor Financial Information DND IS (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
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
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, Accretion Expense                       26.9 41.8 45.5 81.0
Selling and administrative expenses                       90.7 153.4 176.4 227.1
Restructuring Charges                       2.8 15.5 23.5 26.0
Gain (Loss) on Disposition 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
Income (Loss) from Equity Method Investments 28.8                     (26.2) 16.2 (15.9) (107.6)
Loss on early debt extinguishment 29.5           (8.3) $ (59.5)       29.5 (29.5) (67.8) (1.6)
Interest Expense       126.2               150.4 298.6 465.4 426.6
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 Expense (Benefit)         7.9   $ 67.4         (22.7) (94.5) (207.1) 147.4
(Loss) Income from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest (175.2) (97.7) (223.2) (167.7) (502.0)       (126.4) (1,006.0) (148.8) (423.6) (663.8) (1,783.2) (695.3)
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 (188.3) (135.8) (226.2) (171.1) (474.3)       (283.9) (1,042.3) (157.7) (477.2) (721.4) (1,958.2) (723.5)
Less: Net income attributable to noncontrolling interests                       7.9 7.9 7.1 9.7
Net loss attributable to common stockholders $ (192.7) $ (137.6) $ (227.9) $ (171.1) $ (473.5)       $ (286.7) $ (1,044.1) $ (161.0) (485.1) $ (729.3) $ (1,965.3) $ (733.2)
Debtor Subsidiaries [Member]                              
Revenues                       2,074.0      
Operating costs and expenses (exclusive of items shown separately below)                       1,692.9      
Depreciation, depletion and amortization                       177.6      
Asset Retirement Obligation, Accretion Expense                       11.6      
Selling and administrative expenses                       81.4      
Restructuring Charges                       2.2      
Gain (Loss) on Disposition of Assets                       (19.7)      
Asset Impairment                       37.5      
Income (Loss) from Equity Method Investments                       212.6      
Loss on early debt extinguishment                       29.5      
Interest Expense                       143.2      
Interest income                       (3.7)      
Reorganization Items                       155.1      
(Loss) income from continuing operations before income taxes                       (446.2)      
Income Tax Expense (Benefit)                       (20.6)      
(Loss) Income from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest                       (425.6)      
Loss from discontinued operations, net of income taxes                       (59.5)      
Net (loss) income                       (485.1)      
Less: Net income attributable to noncontrolling interests                       0.0      
Net loss attributable to common stockholders                       (485.1)      
Non-Debtor Subsidiaries [Member]                              
Revenues                       1,494.7      
Operating costs and expenses (exclusive of items shown separately below)                       1,347.0      
Depreciation, depletion and amortization                       159.1      
Asset Retirement Obligation, Accretion Expense                       15.3      
Selling and administrative expenses                       9.3      
Restructuring Charges                       0.6      
Gain (Loss) on Disposition of Assets                       (1.7)      
Asset Impairment                       193.2      
Income (Loss) from Equity Method Investments                       (29.2)      
Loss on early debt extinguishment                       0.0      
Interest Expense                       16.9      
Interest income                       (10.0)      
Reorganization Items                       3.9      
(Loss) income from continuing operations before income taxes                       (209.7)      
Income Tax Expense (Benefit)                       (2.1)      
(Loss) Income from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest                       (207.6)      
Loss from discontinued operations, net of income taxes                       5.9      
Net (loss) income                       (201.7)      
Less: Net income attributable to noncontrolling interests                       7.9      
Net loss attributable to common stockholders                       (209.6)      
Debtor Non-Debtor Eliminations [Member]                              
Revenues                       (4.0)      
Operating costs and expenses (exclusive of items shown separately below)                       (4.0)      
Depreciation, depletion and amortization                       0.0      
Asset Retirement Obligation, Accretion Expense                       0.0      
Selling and administrative expenses                       0.0      
Restructuring Charges                       0.0      
Gain (Loss) on Disposition of Assets                       0.0      
Asset Impairment                       0.0      
Income (Loss) from Equity Method Investments                       (209.6)      
Loss on early debt extinguishment                       0.0      
Interest Expense                       (9.7)      
Interest income                       (9.7)      
Reorganization Items                       0.0      
(Loss) income from continuing operations before income taxes                       209.6      
Income Tax Expense (Benefit)                       0.0      
(Loss) Income from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest                       209.6      
Loss from discontinued operations, net of income taxes                       0.0      
Net (loss) income                       209.6      
Less: Net income attributable to noncontrolling interests                       0.0      
Net loss attributable to common stockholders                       $ 209.6