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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash provided by operating activities:    
Net income $ 965.6 $ 811.4
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation, amortization, depletion and accretion 865.6 765.6
Non-cash interest expense 34.9 45.1
Stock-based compensation 21.8 21.4
Deferred tax provision 47.5 33.4
Provision for doubtful accounts, net of adjustments 19.9 19.7
Loss on extinguishment of debt 0.0 0.2
Gain on disposition of assets and asset impairments, net (0.3) (4.7)
Loss (gain) from unconsolidated equity method investments 42.5 2.7
Other non-cash items (0.4) (1.5)
Change in assets and liabilities, net of effects from business acquisitions and divestitures:    
Accounts receivable (69.4) (52.0)
Prepaid expenses and other assets 36.2 138.5
Accounts payable 19.5 35.1
Capping, closure and post-closure expenditures (22.2) (24.5)
Remediation expenditures (26.7) (21.2)
Other liabilities (47.3) (5.4)
Proceeds for retirement of certain hedging relationships 23.7 2.4
Cash provided by operating activities 1,910.9 1,766.2 CloseClose
Cash used in investing activities:    
Purchases of property and equipment (917.9) (714.3)
Proceeds from sales of property and equipment 5.3 17.1
Cash used in acquisitions and investments, net of cash and restricted cash acquired (201.0) (987.7)
Cash paid for business divestitures 1.7 (0.3)
Purchases of restricted marketable securities (17.0) (9.7)
Sales of restricted marketable securities 16.4 9.1
Other (0.2) 11.5
Cash used in investing activities (1,112.7) (1,674.3) CloseClose
Cash used in financing activities:    
Proceeds from credit facilities and notes payable, net of fees 10,484.2 15,401.2
Proceeds from issuance of senior notes, net of discount and fees 888.9 1,183.6
Payments of credit facilities and notes payable (11,274.0) (16,286.9)
Issuances of common stock, net (21.0) (7.0)
Purchases of common stock for treasury (167.6) 0.0
Cash dividends paid (336.8) (313.0)
Distributions paid to non-controlling interests in consolidated subsidiary (0.3) 0.0
Contingent consideration payments (8.0) (11.6)
Cash used in financing activities (434.6) (33.7) CloseClose
Effect of foreign exchange rate changes on cash 0.7 0.5 CloseClose
Increase in cash, cash equivalents, restricted cash and restricted cash equivalents 364.3 58.7
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period 227.5 214.3
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period $ 591.8 $ 273.0