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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Cash Flows From Operating Activities          
Net income $ 129.9 $ 207.0      
Loss from discontinued operations, net of income taxes 3.4 1.3      
Income from continuing operations, net of income taxes 133.3 208.3      
Adjustments to reconcile income from continuing operations, net of income taxes to net cash provided by operating activities:          
Depreciation, depletion and amortization 172.5 169.6      
Noncash interest expense, net 5.5 3.1      
Deferred income taxes 0.0 0.7      
Noncash share-based compensation 11.6 8.1      
Net gain on disposals (1.5) (30.6)      
Income from equity affiliates (3.5) (22.0)      
Provision for North Goonyella equipment loss 24.7 0.0 $ 66.4    
North Goonyella insurance recovery (116.9) 0.0      
Foreign currency option contracts 1.1 2.0      
Noncash reorganization items, net 0.0 (12.8)      
Changes in current assets and liabilities:          
Accounts receivable 5.5 117.1      
Inventories 11.1 25.2      
Other current assets (3.1) (34.3)      
Accounts payable and accrued expenses (30.6) (45.4)      
Collateral arrangements 0.0 214.0      
Asset retirement obligations 5.5 7.0      
Workers’ compensation obligations 0.8 0.3      
Postretirement benefit obligations (6.2) (2.6)      
Pension obligations 1.0 (32.3)      
(Payments for) proceeds from other operating activities (10.0) 5.3      
Net cash provided by continuing operations 200.8 580.7      
Net cash used in discontinued operations (3.2) (1.0)      
Net cash provided by operating activities 197.6 579.7      
Cash Flows From Investing Activities          
Additions to property, plant, equipment and mine development (35.8) (53.7)      
Changes in accrued expenses related to capital expenditures (3.8) (4.9)      
Federal coal lease expenditures 0.0 (0.5)      
Proceeds from disposal of assets, net of receivables 11.0 23.0      
Amount attributable to acquisition of Shoal Creek Mine (2.4) 0.0      
Contributions to joint ventures (118.4) (123.5)      
Distributions from joint ventures 110.9 120.7      
Advances to related parties (1.5) (2.0)      
Cash receipts from Middlemount Coal Pty Ltd 1.1 35.8      
(Payments for) proceeds from other investing activities 0.8 (1.3)      
Net cash used in investing activities (38.1) (6.4)      
Cash Flows From Financing Activities          
Repayments of long-term debt (8.3) (8.2)      
Common stock repurchases (98.8) (175.5)      
Repurchase of employee common stock relinquished for tax withholding (1.4) 0.0      
Dividends paid (214.4) (15.0)      
Distributions to noncontrolling interests (14.3) (6.6)      
(Payments for) proceeds from other financing activities (0.1) 0.2      
Net cash used in financing activities (337.3) (205.1)      
Net change in cash, cash equivalents and restricted cash (177.8) 368.2      
Cash, cash equivalents and restricted cash at beginning of period 1,017.4 1,070.2 1,070.2    
Cash, cash equivalents and restricted cash at end of period 839.6 1,438.4 1,017.4    
Reconciliation of cash, cash equivalents and restricted cash          
Cash and cash equivalents       $ 798.1 $ 981.9
Restricted cash included in “Investments and other assets”       41.5 35.5
Cash, cash equivalents and restricted cash $ 1,017.4 $ 1,070.2 $ 1,070.2 $ 839.6 $ 1,017.4