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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash provided by operating activities:    
Net income $ 736.5 $ 614.5
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation, amortization, depletion and accretion 841.7 828.9
Non-cash interest expense 31.4 32.6
Restructuring related charges 22.5 12.2
Stock-based compensation 29.4 27.3
Deferred tax provision 113.7 60.5
Provision for doubtful accounts, net of adjustments 24.4 22.8
Loss on extinguishment of debt 0.3 0.0
Gain on disposition of assets and asset impairments, net (1.7) (22.7)
Withdrawal costs - multiemployer pension funds 0.0 1.1
Environmental adjustments 3.3 0.0
Loss from unconsolidated equity method investment 5.7 8.2
Other non-cash items 0.6 (0.8)
Change in assets and liabilities, net of effects from business acquisitions and divestitures:    
Accounts receivable (72.1) (149.0)
Prepaid expenses and other assets (13.5) (0.8)
Accounts payable 58.6 30.3
Restructuring expenditures (18.7) (14.6)
Capping, closure and post-closure expenditures (42.5) (44.5)
Remediation expenditures (30.2) (37.7)
Other liabilities 26.4 13.8
Proceeds from retirement of certain hedging relationships 31.1 0.0
Cash provided by operating activities 1,746.9 1,382.1
Cash used in investing activities:    
Purchases of property and equipment (820.5) (769.0)
Proceeds from sales of property and equipment 7.9 4.2
Cash used in acquisitions and investments, net of cash acquired (130.5) (136.4)
Cash received from (used in) business divestitures 10.6 (10.6)
Purchases of restricted marketable securities (35.4) (9.6)
Sales of restricted marketable securities 36.2 9.2
Other 0.0 0.6
Cash used in investing activities (931.7) (911.6)
Cash used in financing activities:    
Proceeds from notes payable and long-term debt, net of fees 3,296.7 3,428.1
Proceeds from issuance of senior notes, net of discount and fees 782.0 0.0
Payments of notes payable and long-term debt and senior notes (4,032.6) (3,238.9)
Issuances of common stock, net 19.9 26.7
Purchases of common stock for treasury (574.9) (353.3)
Cash dividends paid (340.0) (324.8)
Distributions paid to noncontrolling interests in consolidated subsidiary (0.6) (0.7)
Other (7.9) (5.5)
Cash used in financing activities (857.4) (468.4)
(Decrease) increase in cash, cash equivalents, restricted cash and restricted cash equivalents (42.2) 2.1
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year 179.1 113.0
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period $ 136.9 $ 115.1