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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash provided by operating activities:      
Net income $ 1,037.6 $ 1,279.0 $ 613.2
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation, amortization, depletion and accretion 1,114.1 1,116.1 1,070.2
Non-cash interest expense 41.2 43.6 53.4
Restructuring related charges 26.4 17.6 40.7
Stock-based compensation 39.0 34.6 23.2
Deferred tax provision (benefit) 152.1 (379.0) 47.2
Provision for doubtful accounts, net of adjustments 34.8 30.6 20.4
Loss on extinguishment of debt 0.3 0.8 196.2
(Gain) loss on disposition of assets and asset impairments, net (58.9) (29.5) 0.3
Withdrawal costs - multiemployer pension funds 0.0 1.2 5.6
Environmental adjustments 5.0 0.4 2.0
Loss from unconsolidated equity method investment 35.8 27.4 6.1
Other non-cash items 0.6 (1.2) (25.5)
Change in assets and liabilities, net of effects from business acquisitions and divestitures:      
Accounts receivable (29.6) (118.9) (52.3)
Prepaid expenses and other assets (152.5) (36.4) (1.1)
Accounts payable 85.9 21.7 (9.8)
Restructuring expenditures (24.7) (18.6) (32.5)
Capping, closure and post-closure expenditures (71.9) (62.7) (77.4)
Remediation expenditures (48.8) (54.8) (66.8)
Other liabilities 25.3 38.8 34.7
Proceeds from retirement of certain hedging relationships 31.1 0.0 0.0
Cash provided by operating activities 2,242.8 1,910.7 1,847.8
Cash used in investing activities:      
Purchases of property and equipment (1,071.8) (989.8) (927.8)
Proceeds from sales of property and equipment 31.6 6.1 9.8
Cash used in acquisitions and investments, net of cash and restricted cash acquired (277.3) (351.8) (62.4)
Cash received from business divestitures 89.2 4.7 15.0
Purchases of restricted marketable securities (38.2) (18.5) (29.9)
Sales of restricted marketable securities 37.7 18.1 32.1
Other (0.3) 1.0 (1.3)
Cash used in investing activities (1,229.1) (1,330.2) (964.5)
Cash used in financing activities:      
Proceeds from notes payable and long-term debt, net of fees 4,347.6 4,791.1 3,911.4
Proceeds from issuance of senior notes, net of discount and fees 781.8 641.5 489.4
Payments of notes payable and long-term debt and senior notes (5,000.7) (4,922.8) (4,307.1)
Premiums paid on extinguishment of debt 0.0 0.0 (176.9)
Issuances of common stock, net 23.2 36.9 49.7
Purchases of common stock for treasury (736.9) (610.7) (403.8)
Cash dividends paid (461.8) (440.5) (418.9)
Distributions paid to noncontrolling interests in consolidated subsidiary (0.6) (0.7) (0.7)
Other (12.1) (9.2) 0.1
Cash used in financing activities (1,059.5) (514.4) (856.8)
(Decrease) increase in cash, cash equivalents, restricted cash and restricted cash equivalents (45.8) 66.1 26.5
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year 179.1 113.0 86.5
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of year $ 133.3 $ 179.1 $ 113.0