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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash provided by operating activities:    
Net income $ 246.8 $ 234.9
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation, amortization, depletion and accretion 289.5 272.0
Non-cash interest expense 14.9 11.0
Restructuring related charges 3.8 3.0
Stock-based compensation 9.9 11.1
Deferred tax provision 17.6 27.7
Additions charged to expense 4.9 7.5
Gain on disposition of assets and asset impairments, net (4.9) (1.4)
Withdrawal costs - multiemployer pension funds 4.3 0.0
Environmental adjustments (0.4) (10.5)
Loss from unconsolidated equity method investment 13.2 11.6
Other non-cash items 1.2 (0.1)
Change in assets and liabilities, net of effects from business acquisitions and divestitures:    
Accounts receivable 28.0 23.2
Prepaid expenses and other assets 88.2 56.8
Accounts payable (63.5) (45.6)
Restructuring expenditures (3.8) (4.6)
Capping, closure and post-closure expenditures (8.7) (8.4)
Remediation expenditures (17.2) (7.2)
Other liabilities (54.3) (27.3)
Cash provided by operating activities 569.5 553.7
Cash used in investing activities:    
Purchases of property and equipment (346.8) (299.3)
Proceeds from sales of property and equipment 6.0 4.1
Cash used in acquisitions and investments, net of cash and restricted cash acquired (61.0) (62.7)
Cash received from business divestitures (0.2) 0.0
Purchases of restricted marketable securities (14.0) (5.0)
Sales of restricted marketable securities 5.6 5.1
Other (25.0) (1.3)
Cash used in investing activities (435.4) (359.1)
Cash provided by (used in) financing activities:    
Proceeds from notes payable and long-term debt, net of fees 1,974.9 1,104.9
Proceeds from issuance of senior notes, net of discount and fees 985.6 0.0
Payments of notes payable and long-term debt and senior notes (2,688.7) (1,052.6)
Issuances of common stock, net (9.5) (9.1)
Purchases of common stock for treasury (98.8) (111.5)
Cash dividends paid (129.2) (121.0)
Distributions paid to noncontrolling interests in consolidated subsidiary (0.2) 0.0
Other (2.2) (2.1)
Cash used in financing activities 31.9 (191.4)
Decrease in cash, cash equivalents, restricted cash and restricted cash equivalents 166.0 3.2
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year 177.4 133.3
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period $ 343.4 $ 136.5