Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Successor
Revenues
Sales	$ 1,264.2			$ 2,323.8
Other revenues	213.0			411.7
Total revenues	1,477.2			2,735.5
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)	1,044.9			1,979.7
Depreciation, depletion and amortization	194.5			342.8
Asset retirement obligation expenses	11.3			22.3
Selling and administrative expenses	33.4			67.8
Restructuring charges	1.1			1.1
Other operating (income) loss:
Net gain on disposal of assets	(0.4)			(0.9)
Asset impairment	0.0			0.0
(Income) loss from equity affiliates	(10.5)			(26.2)
Operating profit (loss)	202.9			348.9
Interest expense	(42.4)			(83.8)
Loss on early debt extinguishment	(12.9)			(12.9)
Interest income	(2.0)			(3.5)
Reorganization items, net	0.0			0.0
Income (loss) from continuing operations before income taxes	149.6			255.7
Income tax provision (benefit)	(84.1)			(79.4)
Income (loss) from continuing operations, net of income taxes	233.7			335.1
Loss from discontinued operations, net of income taxes	(3.7)			(6.4)
Net income (loss)	230.0			328.7
Less: Series A Convertible Preferred Stock dividends	23.5			138.6
Less: Net income attributable to noncontrolling interests	5.1			8.9
Net Income (Loss) Attributable to Common Stockholders	$ 201.4			$ 181.2
Loss from continuing operations:
Basic income (loss) per share (in dollars per share)	$ 1.51			$ 1.38
Diluted income (loss) per share (in dollars per share)	1.49			1.37
Net loss attributable to common stockholders:
Basic income (loss) per share (in dollars per share)	1.48			1.33
Diluted income (loss) per share (in dollars per share)	1.47			1.32
Dividends declared per share (in dollars per share)	$ 0			$ 0
Predecessor
Revenues
Sales		$ 1,081.4	$ 1,064.0		$ 2,835.9
Other revenues		244.8	143.1		438.6
Total revenues		1,326.2	1,207.1		3,274.5
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)		963.7	1,064.8		2,981.2
Depreciation, depletion and amortization		119.9	117.8		345.5
Asset retirement obligation expenses		14.6	12.7		37.3
Selling and administrative expenses		37.2	32.1		114.6
Restructuring charges		0.0	0.3		15.5
Other operating (income) loss:
Net gain on disposal of assets		(22.8)	(1.9)		(17.4)
Asset impairment		30.5	0.0		17.2
(Income) loss from equity affiliates		(15.0)	2.9		12.6
Operating profit (loss)		198.1	(21.6)		(232.0)
Interest expense		(32.9)	(58.5)		(243.7)
Loss on early debt extinguishment		0.0	0.0		0.0
Interest income		(2.7)	(1.3)		(4.0)
Reorganization items, net		627.2	29.7		125.1
Income (loss) from continuing operations before income taxes		(459.3)	(108.5)		(596.8)
Income tax provision (benefit)		(263.8)	(10.8)		(108.2)
Income (loss) from continuing operations, net of income taxes		(195.5)	(97.7)		(488.6)
Loss from discontinued operations, net of income taxes		(16.2)	(38.1)		(44.5)
Net income (loss)		(211.7)	(135.8)		(533.1)
Less: Series A Convertible Preferred Stock dividends		0.0	0.0		0.0
Less: Net income attributable to noncontrolling interests		4.8	1.8		3.5
Net Income (Loss) Attributable to Common Stockholders		$ (216.5)	$ (137.6)		$ (536.6)
Loss from continuing operations:
Basic income (loss) per share (in dollars per share)		$ (10.93)	$ (5.44)		$ (26.91)
Diluted income (loss) per share (in dollars per share)		(10.93)	(5.44)		(26.91)
Net loss attributable to common stockholders:
Basic income (loss) per share (in dollars per share)		(11.81)	(7.53)		(29.34)
Diluted income (loss) per share (in dollars per share)		(11.81)	(7.53)		(29.34)
Dividends declared per share (in dollars per share)		$ 0	$ 0		$ 0