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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash provided by operating activities:    
Net income $ 723.7 $ 628.4
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation, amortization, depletion and accretion 692.0 626.3
Non-cash interest expense 38.1 34.2
Stock-based compensation 21.2 38.6
Deferred tax provision 52.8 42.5
Provision for doubtful accounts, net of adjustments 17.2 11.4
(Gain) loss on disposition of assets and asset impairments, net (3.2) 0.2
Environmental adjustments 0.0 4.8
Loss from unconsolidated equity method investments 17.4 28.9
Other non-cash items 6.3 (1.7)
Change in assets and liabilities, net of effects from business acquisitions and divestitures:    
Accounts receivable (150.4) (68.1)
Prepaid expenses and other assets 72.6 88.8
Accounts payable 167.1 54.4
Capping, closure and post-closure expenditures (18.0) (26.8)
Remediation expenditures (21.1) (21.7)
Other liabilities (52.2) 42.6
Cash provided by operating activities 1,563.5 1,482.8
Cash (used in) provided by investing activities:    
Purchases of property and equipment (647.3) (608.6)
Proceeds from sales of property and equipment 20.0 8.2
Cash used in acquisitions and investments, net of cash and restricted cash acquired (2,655.0) (576.6)
Cash received from business divestitures 0.0 45.9
Purchases of restricted marketable securities (9.1) (16.6)
Sales of restricted marketable securities 8.5 14.9
Other (1.0) (0.3)
Cash used in investing activities (3,283.9) (1,133.1)
Cash provided by (used in) financing activities:    
Proceeds from credit facilities and notes payable, net of fees 5,338.9 2,737.9
Payments of credit facilities and notes payable (3,027.1) (2,756.1)
Issuances of common stock, net (15.5) (9.5)
Purchases of common stock for treasury (203.5) (40.1)
Cash dividends paid (291.2) (271.1)
Distributions paid to non-controlling interests in consolidated subsidiary 0.0 (1.2)
Contingent consideration payments (2.9) (11.8)
Cash provided by (used in) financing activities 1,798.7 (351.9)
Effect of foreign exchange rate changes on cash (0.1) 0.0
Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents 78.2 (2.2)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year 105.6 114.2
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period $ 183.7 $ 112.0