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Supplemental Guarantor/Non-Guarantor Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues $ 1,326.2 $ 1,027.2      
Operating Costs and Expenses 963.7 920.2      
Depreciation, Depletion and Amortization 119.9 111.8      
Asset retirement obligation expenses 14.6 13.1      
Selling and administrative expenses 37.2 48.3      
Selling and Administrative expenses related to debt restructuring 0.0        
Restructuring charges 0.0 12.1      
Net gain on disposal of assets 22.8 1.8      
Asset impairment   14.3      
Asset impairment 30.5 17.2 $ 247.9 $ 1,277.8 $ 154.4
Loss from equity affiliates 15.0 (9.0)      
Interest expense 32.9 126.2      
Interest income 2.7 1.4      
Reorganization Items, net 41.4 0.0      
Income (Loss) from Continuing Operations before Income Taxes 126.5 (227.5)      
Income tax benefit (4.5) (65.8)      
Loss from continuing operations, net of income taxes 131.0 (161.7)      
Loss from discontinued operations, net of income taxes 4.1 3.4      
Net income (loss) 126.9 (165.1)      
Net Income (Loss) Attributable to Noncontrolling Interest 4.8 0.0      
Net Income (Loss) Attributable to Common Stockholder 122.1 (165.1)      
Other Comprehensive Income (Loss), Net of Tax 28.5 56.0      
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 155.4 (109.1)      
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 4.8 0.0      
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 150.6 (109.1)      
Debtor Subsidiaries [Member]          
Revenues 733.0        
Operating Costs and Expenses 572.5        
Depreciation, Depletion and Amortization 75.2        
Asset retirement obligation expenses 9.4        
Selling and administrative expenses 32.7        
Net gain on disposal of assets 22.9        
Asset impairment 30.5        
Loss from equity affiliates 148.1        
Interest expense 32.8        
Interest income 2.5        
Reorganization Items, net 40.8        
Income (Loss) from Continuing Operations before Income Taxes 112.6        
Income tax benefit (12.7)        
Loss from continuing operations, net of income taxes 125.3        
Loss from discontinued operations, net of income taxes (3.2)        
Net income (loss) 122.1        
Net Income (Loss) Attributable to Noncontrolling Interest 0.0        
Net Income (Loss) Attributable to Common Stockholder 122.1        
Non-Debtor Subsidiaries [Member]          
Revenues 594.5        
Operating Costs and Expenses 392.5        
Depreciation, Depletion and Amortization 44.7        
Asset retirement obligation expenses 5.2        
Selling and administrative expenses 4.5        
Net gain on disposal of assets (0.1)        
Asset impairment 0.0        
Loss from equity affiliates 15.8        
Interest expense 5.2        
Interest income 5.3        
Reorganization Items, net 0.6        
Income (Loss) from Continuing Operations before Income Taxes 162.8        
Income tax benefit 8.2        
Loss from continuing operations, net of income taxes 154.6        
Loss from discontinued operations, net of income taxes (0.9)        
Net income (loss) 153.7        
Net Income (Loss) Attributable to Noncontrolling Interest 4.8        
Net Income (Loss) Attributable to Common Stockholder 148.9        
Parent Company [Member]          
Revenues 0.0 0.0      
Operating Costs and Expenses 27.5 17.9      
Depreciation, Depletion and Amortization 0.0 0.0      
Asset retirement obligation expenses 0.0 0.0      
Selling and administrative expenses 2.0 2.4      
Restructuring charges   0.0      
Net gain on disposal of assets 0.0 0.0      
Asset impairment 0.0        
Asset impairment   0.0      
Loss from equity affiliates (177.2) (53.3)      
Interest expense 32.9 122.6      
Interest income 0.0 0.0      
Reorganization Items, net (0.2)        
Income (Loss) from Continuing Operations before Income Taxes 115.0 (196.2)      
Income tax benefit (10.0) (33.1)      
Loss from continuing operations, net of income taxes 125.0 (163.1)      
Loss from discontinued operations, net of income taxes (2.9) (2.0)      
Net income (loss) 122.1 (165.1)      
Net Income (Loss) Attributable to Noncontrolling Interest 0.0        
Net Income (Loss) Attributable to Common Stockholder 122.1 (165.1)      
Other Comprehensive Income (Loss), Net of Tax 28.5 56.0      
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 150.6        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.0        
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 150.6 (109.1)      
Guarantor Subsidiaries [Member]          
Revenues 732.9 663.9      
Operating Costs and Expenses 551.4 522.3      
Depreciation, Depletion and Amortization 69.7 51.1      
Asset retirement obligation expenses 7.2 6.5      
Selling and administrative expenses 30.6 42.2      
Restructuring charges   11.4      
Net gain on disposal of assets (22.9) 1.8      
Asset impairment 0.0        
Asset impairment   0.0      
Loss from equity affiliates 0.9 (1.2)      
Interest expense 4.4 5.8      
Interest income (2.1) 1.0      
Reorganization Items, net 41.0        
Income (Loss) from Continuing Operations before Income Taxes 52.7 26.2      
Income tax benefit (2.7) (18.5)      
Loss from continuing operations, net of income taxes 55.4 44.7      
Loss from discontinued operations, net of income taxes (0.3) (0.5)      
Net income (loss) 55.1 44.2      
Net Income (Loss) Attributable to Noncontrolling Interest 0.0        
Net Income (Loss) Attributable to Common Stockholder 55.1 44.2      
Other Comprehensive Income (Loss), Net of Tax 5.8 5.1      
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 60.9        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.0        
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 60.9 49.3      
Non-Guarantor Subsidiaries [Member]          
Revenues 661.7 441.1      
Operating Costs and Expenses 453.2 457.8      
Depreciation, Depletion and Amortization 50.2 60.7      
Asset retirement obligation expenses 7.4 6.6      
Selling and administrative expenses 4.6 3.7      
Restructuring charges   0.7      
Net gain on disposal of assets 0.1 0.0      
Asset impairment 30.5        
Asset impairment   17.2      
Loss from equity affiliates (15.9) 7.8      
Interest expense 5.5 6.2      
Interest income (10.5) 8.8      
Reorganization Items, net 0.6        
Income (Loss) from Continuing Operations before Income Taxes 136.0 (110.8)      
Income tax benefit 8.2 (14.2)      
Loss from continuing operations, net of income taxes 127.8 (96.6)      
Loss from discontinued operations, net of income taxes (0.9) (0.9)      
Net income (loss) 126.9 (97.5)      
Net Income (Loss) Attributable to Noncontrolling Interest 4.8        
Net Income (Loss) Attributable to Common Stockholder 122.1 (97.5)      
Other Comprehensive Income (Loss), Net of Tax 5.5 2.7      
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 132.4        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 4.8        
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 127.6 (94.8)      
Consolidation, Eliminations [Member]          
Revenues (68.4) (77.8)      
Operating Costs and Expenses (68.4) (77.8)      
Depreciation, Depletion and Amortization 0.0 0.0      
Asset retirement obligation expenses 0.0 0.0      
Selling and administrative expenses 0.0 0.0      
Restructuring charges   0.0      
Net gain on disposal of assets 0.0 0.0      
Asset impairment 0.0        
Asset impairment   0.0      
Loss from equity affiliates 177.2 53.3      
Interest expense (9.9) (8.4)      
Interest income 9.9 (8.4)      
Reorganization Items, net 0.0        
Income (Loss) from Continuing Operations before Income Taxes (177.2) 53.3      
Income tax benefit 0.0 0.0      
Loss from continuing operations, net of income taxes (177.2) 53.3      
Loss from discontinued operations, net of income taxes 0.0 0.0      
Net income (loss) (177.2) 53.3      
Net Income (Loss) Attributable to Noncontrolling Interest 0.0        
Net Income (Loss) Attributable to Common Stockholder (177.2) 53.3      
Other Comprehensive Income (Loss), Net of Tax (11.3) (7.8)      
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (188.5)        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.0        
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ (188.5) $ 45.5