v3.26.3
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Cash Flows From Operating Activities        
Net loss $ (28.9) $ (66.9) $ (140.7) $ (54.9)
Loss from discontinued operations, net of income taxes 0.2 0.3 0.7 1.0
Loss from continuing operations, net of income taxes (28.7) (66.6) (140.0) (53.9)
Adjustments to reconcile loss from continuing operations, net of income taxes to net cash provided by operating activities:        
Depreciation, depletion and amortization 97.6 100.0 314.6 285.5
Noncash interest expense, net 5.9 0.9 8.7 4.2
Change in fair value of bifurcated conversion option (7.2) 0.0 (7.2) 0.0
Deferred income taxes     (76.4) (11.3)
Noncash share-based compensation     11.1 8.9
Net gain on disposals (1.3) (5.3) (17.4) (25.3)
Loss from equity affiliates 1.9 2.6 17.5 10.2
Induced Conversion of Convertible Debt Expense 3.3 0.0 20.5 0.0
Unrealized losses (gains) on foreign currency option contracts     2.8 (6.1)
Changes in current assets and liabilities:        
Accounts receivable     (63.2) 69.5
Inventories     (67.4) (11.8)
Other current assets     (65.2) 37.7
Accounts payable and accrued expenses     48.3 (0.3)
Collateral arrangements     77.7 (5.6)
Asset retirement obligations     (5.6) 6.3
Workers’ compensation obligations     0.1 0.0
Postretirement benefit obligations     (26.9) (34.6)
Pension obligations     (0.2) (4.0)
Other, net     (2.8) (2.6)
Net cash provided by continuing operations     29.0 266.8
Net cash used in discontinued operations     (1.8) (1.7)
Net cash provided by operating activities     27.2 265.1
Cash Flows From Investing Activities        
Additions to property, plant, equipment and mine development     (203.6) (280.8)
Changes in accrued expenses related to capital expenditures     (40.2) (34.6)
Returned deposit related to terminated acquisition     0.0 29.0
Proceeds from disposal of assets, net of receivables     10.0 16.6
Contributions to joint ventures     (514.0) (436.2)
Distributions from joint ventures     514.5 455.0
Other, net     (2.2) (1.8)
Net cash used in investing activities     (235.5) (252.8)
Cash Flows From Financing Activities        
Proceeds from Issuance of Long-Term Debt     360.0 0.0
Repayments of long-term debt     (562.3) (9.9)
Repayment of loan note related to terminated acquisition     0.0 (9.3)
Payment of debt issuance and other deferred financing costs     (14.6) (1.8)
Payment of Capped Call Transactions (16.7) 0.0 (16.7)  
Share Repurchase Program, Excise Tax, Paid     0.0 (1.7)
Repurchase of employee common stock relinquished for tax withholding     (3.3) (0.8)
Dividends paid     (27.4) (27.5)
Distributions to noncontrolling interests     (16.4) (22.8)
Net cash used in financing activities     (280.7) (73.8)
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation        
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation, Beginning Balance     1,284.5 1,382.6
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation, Ending Balance 795.5 $ 1,321.1 795.5 1,321.1
Cash and cash equivalents 434.3   434.3  
Restricted Cash $ 361.2   361.2  
Net change in cash, cash equivalents and restricted cash     $ (489.0) $ (61.5)