Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Successor
Cash Flows From Operating Activities
Net income		$ 207.0
Loss from discontinued operations, net of income taxes		1.3
Income from continuing operations, net of income taxes		208.3
Adjustments to reconcile income from continuing operations, net of income taxes to net cash provided by operating activities:
Depreciation, depletion and amortization		169.6
Noncash interest expense, net		3.1
Deferred income taxes		0.7
Noncash share-based compensation		8.1
Asset impairment		0.0
Net gain on disposals		(30.6)
Income from equity affiliates		(22.0)
Foreign currency option contracts		2.0
Reclassification from other comprehensive earnings for terminated hedge contracts		0.0
Noncash reorganization items, net		(12.8)
Changes in current assets and liabilities:
Accounts receivable		117.1
Inventories		25.2
Net assets from coal trading activities		(11.6)
Other current assets		(25.6)
Accounts payable and accrued expenses		(42.5)
Collateral arrangements		214.0
Asset retirement obligations		7.0
Workers’ compensation obligations		0.3
Postretirement benefit obligations		(2.6)
Pension obligations		(32.3)
Other, net		5.3
Net cash provided by continuing operations		580.7
Net cash used in discontinued operations		(1.0)
Net cash provided by operating activities		579.7
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development		(53.7)
Changes in accrued expenses related to capital expenditures		(4.9)
Federal coal lease expenditures		(0.5)
Proceeds from disposal of assets, net of receivables		23.0
Contributions to joint ventures		(123.5)
Distributions from joint ventures		120.7
Advances to related parties		(2.0)
Repayments of loans from related parties		35.3
Payments for (Proceeds from) Other Investing Activities		0.8
Net cash (used in) provided by investing activities		(6.4)
Cash Flows From Financing Activities
Proceeds from long-term debt		0.0
Repayments of long-term debt		(8.2)
Payment of deferred financing costs		0.0
Common stock repurchases		(175.5)
Dividends paid		(15.0)
Distributions to noncontrolling interests		(6.6)
Proceeds from (Payments for) Other Financing Activities		0.2
Net cash (used in) provided by financing activities		(205.1)
Net change in cash, cash equivalents and restricted cash		368.2
Cash, cash equivalents and restricted cash at beginning of period	[1]	1,070.2
Cash, cash equivalents and restricted cash at end of period	[2]	1,438.4
Cash and cash equivalents at beginning of period		1,012.1
Restricted cash at beginning of period		40.1
Restricted cash included in investments and other assets at beginning of period		18.0
Cash, cash equivalents and restricted cash at beginning of period	[1]	1,070.2
Cash and cash equivalents at end of period		1,416.6
Restricted cash at end of period		0.0
Restricted cash included in investments and other assets at end of period		$ 21.8
Predecessor
Cash Flows From Operating Activities
Net income			$ 120.2
Loss from discontinued operations, net of income taxes			4.1
Income from continuing operations, net of income taxes			124.3
Adjustments to reconcile income from continuing operations, net of income taxes to net cash provided by operating activities:
Depreciation, depletion and amortization			119.9
Noncash interest expense, net			0.5
Deferred income taxes			1.7
Noncash share-based compensation			1.9
Asset impairment			30.5
Net gain on disposals			(22.8)
Income from equity affiliates			(15.0)
Foreign currency option contracts			0.0
Reclassification from other comprehensive earnings for terminated hedge contracts			27.6
Noncash reorganization items, net			10.0
Changes in current assets and liabilities:
Accounts receivable			159.3
Inventories			(47.2)
Net assets from coal trading activities			(0.5)
Other current assets			0.1
Accounts payable and accrued expenses			(64.9)
Collateral arrangements			(66.4)
Asset retirement obligations			10.2
Workers’ compensation obligations			(3.1)
Postretirement benefit obligations			0.8
Pension obligations			5.4
Other, net			(8.0)
Net cash provided by continuing operations			264.3
Net cash used in discontinued operations			(8.2)
Net cash provided by operating activities			256.1
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development			(32.8)
Changes in accrued expenses related to capital expenditures			(1.4)
Federal coal lease expenditures			(0.5)
Proceeds from disposal of assets, net of receivables			24.3
Contributions to joint ventures			(95.4)
Distributions from joint ventures			90.5
Advances to related parties			(0.4)
Repayments of loans from related parties			31.1
Payments for (Proceeds from) Other Investing Activities			0.3
Net cash (used in) provided by investing activities			15.1
Cash Flows From Financing Activities
Proceeds from long-term debt			1,000.0
Repayments of long-term debt			(2.1)
Payment of deferred financing costs			(45.4)
Common stock repurchases			0.0
Dividends paid			0.0
Distributions to noncontrolling interests			(0.1)
Proceeds from (Payments for) Other Financing Activities			(0.1)
Net cash (used in) provided by financing activities			952.3
Net change in cash, cash equivalents and restricted cash			1,223.5
Cash, cash equivalents and restricted cash at beginning of period			941.2
Cash, cash equivalents and restricted cash at end of period			2,164.7
Cash, cash equivalents and restricted cash at beginning of period			$ 941.2

[1] The following table provides a reconciliation of “Cash, cash equivalents and restricted cash at beginning of period”:

[2] The following table provides a reconciliation of “Cash, cash equivalents and restricted cash at end of period”: