Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash provided by operating activities:
Net income	$ 485.8	$ 473.6
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation, amortization, depletion and accretion	556.7	559.2
Non-cash interest expense	23.3	21.4
Restructuring related charges	4.5	13.3
Stock-based compensation	20.1	19.9
Deferred tax provision	40.3	52.4
Provision for doubtful accounts, net of adjustments	15.9	13.6
Loss on extinguishment of debt	0.0	0.3
(Gain) loss on disposition of assets and asset impairments, net	(0.2)	0.6
Environmental adjustments	(10.3)	2.5
Loss from unconsolidated equity method investment	23.1	0.1
Other non-cash items	(0.8)	0.5
Change in assets and liabilities, net of effects from business acquisitions and divestitures:
Accounts receivable	(53.0)	(17.7)
Prepaid expenses and other assets	101.3	48.0
Accounts payable	12.8	30.7
Restructuring expenditures	(6.5)	(12.6)
Capping, closure and post-closure expenditures	(23.8)	(22.1)
Remediation expenditures	(17.8)	(21.2)
Other liabilities	(35.8)	(2.6)
Proceeds from retirement of certain hedging relationships	0.0	31.1
Cash provided by operating activities	1,135.6	1,191.0
Cash used in investing activities:
Purchases of property and equipment	(588.7)	(542.1)
Proceeds from sales of property and equipment	7.9	4.3
Cash used in acquisitions and investments, net of cash and restricted cash acquired	(178.9)	(69.3)
Cash received from business divestitures	(0.2)	1.1
Purchases of restricted marketable securities	(8.2)	(32.1)
Sales of restricted marketable securities	7.8	31.9
Other	(2.3)	0.2
Cash used in investing activities	(762.6)	(606.0)
Cash used in financing activities:
Proceeds from notes payable and long-term debt, net of fees	2,284.2	2,418.7
Proceeds from issuance of senior notes, net of discount and fees	0.0	781.9
Payments of notes payable and long-term debt and senior notes	(2,194.2)	(3,133.8)
Issuances of common stock, net	(3.1)	8.2
Purchases of common stock for treasury	(202.5)	(474.0)
Cash dividends paid	(241.7)	(227.7)
Distributions paid to noncontrolling interests in consolidated subsidiary	(0.2)	(0.6)
Other	(5.1)	(4.1)
Cash used in financing activities	(362.6)	(631.4)
Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents	10.4	(46.4)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year	133.3	179.1
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period	$ 143.7	$ 132.7