Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Millions		3 Months Ended			6 Months Ended
	Apr. 01, 2017	Jun. 30, 2017	Apr. 01, 2017	Jun. 30, 2016	Jun. 30, 2016
Other operating (income) loss:
Income tax provision (benefit)	$ (266.0)	$ 4.7	$ (263.8)	$ (37.6)	$ (97.4)
Total after income taxes				(223.2)	(390.9)
Net income (loss)				(226.2)	(397.3)
Net loss attributable to common stockholders				(227.9)	(399.0)
Successor
Revenues
Sales		1,059.6
Other revenues		198.7
Total revenues		1,258.3
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)		934.8
Depreciation, depletion and amortization		148.3
Asset retirement obligation expenses		11.0
Selling and administrative expenses		34.4
Restructuring charges		0.0
Other operating (income) loss:
Net gain on disposal of assets		(0.5)
Asset impairment		0.0
(Income) loss from equity affiliates		(15.7)
Operating profit (loss)		146.0
Interest expense		41.4
Interest income		(1.5)
Reorganization items, net		0.0
Income (loss) from continuing operations before income taxes		106.1
Income tax provision (benefit)		4.7
Total after income taxes		101.4
Loss from discontinued operations, net of income taxes		(2.7)
Net income (loss)		98.7
Less: Series A Convertible Preferred Stock dividends		115.1
Less: Net income attributable to noncontrolling interests		3.8
Net loss attributable to common stockholders		$ (20.2)
Loss from continuing operations:
Basic loss per share (in dollars per share)		$ (0.18)
Diluted loss per share (in dollars per share)		(0.18)
Net loss attributable to common stockholders:
Basic loss per share (in dollars per share)		(0.21)
Diluted loss per share (in dollars per share)		(0.21)
Dividends declared per share (in dollars per share)		$ 0
Predecessor
Revenues
Sales	0.0		1,081.4	892.4	1,771.9
Other revenues	0.0		244.8	147.8	295.5
Total revenues	0.0		1,326.2	1,040.2	2,067.4
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)	0.0		963.7	996.2	1,916.4
Depreciation, depletion and amortization	0.0		119.9	115.9	227.7
Asset retirement obligation expenses	0.0		14.6	11.5	24.6
Selling and administrative expenses	0.0		37.2	34.2	82.5
Restructuring charges	0.0		0.0	3.1	15.2
Other operating (income) loss:
Net gain on disposal of assets	0.0		(22.8)	(13.7)	(15.5)
Asset impairment	0.0		30.5	0.0	17.2
(Income) loss from equity affiliates	0.0		(15.0)	0.7	9.7
Operating profit (loss)	0.0		198.1	(107.7)	(210.4)
Interest expense	0.0		32.9	59.0	185.2
Interest income	0.0		(2.7)	(1.3)	(2.7)
Reorganization items, net	585.8		627.2	95.4	95.4
Income (loss) from continuing operations before income taxes	(585.8)		(459.3)	(260.8)	(488.3)
Income tax provision (benefit)	(266.0)		(263.8)	(37.6)	(97.4)
Total after income taxes	(319.8)		(195.5)	(223.2)	(390.9)
Loss from discontinued operations, net of income taxes	(12.1)		(16.2)	(3.0)	(6.4)
Net income (loss)	(331.9)		(211.7)	(226.2)	(397.3)
Less: Series A Convertible Preferred Stock dividends	0.0		0.0	0.0	0.0
Less: Net income attributable to noncontrolling interests	0.0		4.8	1.7	1.7
Net loss attributable to common stockholders	$ (331.9)		$ (216.5)	$ (227.9)	$ (399.0)
Loss from continuing operations:
Basic loss per share (in dollars per share)	$ (17.44)		$ (10.93)	$ (12.30)	$ (21.47)
Diluted loss per share (in dollars per share)	(17.44)		(10.93)	(12.30)	(21.47)
Net loss attributable to common stockholders:
Basic loss per share (in dollars per share)	(18.10)		(11.81)	(12.46)	(21.82)
Diluted loss per share (in dollars per share)	(18.10)		(11.81)	(12.46)	(21.82)
Dividends declared per share (in dollars per share)	$ 0		$ 0	$ 0	$ 0