Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash provided by operating activities:
Net income	$ 337.9	$ 362.9
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation, amortization, depletion and accretion	532.9	518.7
Non-cash interest expense	23.1	23.1
Restructuring charges	26.4	0.0
Stock-based compensation	12.1	11.6
Deferred tax benefit	9.0	(12.7)
Provision for doubtful accounts, net of adjustments	11.6	11.1
Gain on disposition of assets, net and asset impairments	(2.3)	(3.0)
Withdrawal liability - multiemployer pension funds	5.6	0.0
Environmental adjustments	0.3	(1.3)
Excess income tax benefit from stock-based compensation activity and other non-cash items	(8.0)	(5.1)
Change in assets and liabilities, net of effects from business acquisitions and divestitures:
Accounts receivable	(39.2)	(14.4)
Prepaid expenses and other assets	(67.1)	11.0
Accounts payable	(27.4)	4.3
Restructuring expenditures	(14.5)	0.0
Capping, closure and post-closure expenditures	(35.3)	(26.2)
Remediation expenditures	(32.8)	(31.1)
Other liabilities	112.0	52.3
Cash provided by operating activities	844.3	901.2
Cash used in investing activities:
Purchases of property and equipment	(512.0)	(499.2)
Proceeds from sales of property and equipment	5.5	8.1
Cash used in business acquisitions, net of cash acquired	(13.9)	(512.6)
Change in restricted cash and marketable securities	3.6	6.2
Other	(0.4)	(0.7)
Cash used in investing activities	(517.2)	(998.2)
Cash used in financing activities:
Proceeds from notes payable and long-term debt	1,789.6	793.2
Proceeds from issuance of senior notes, net of discount	0.0	497.9
Payments of notes payable and long-term debt	(1,729.8)	(803.5)
Fees paid to issue senior notes and retire certain hedging relationships	(3.5)	(3.3)
Issuances of common stock	26.7	33.0
Excess income tax benefit from stock-based compensation activity	6.3	4.8
Purchases of common stock for treasury	(196.1)	(199.5)
Cash dividends paid	(207.1)	(197.2)
Distributions paid to noncontrolling interests	(0.7)	(0.5)
Other	(2.9)	(3.2)
Cash (used in) provided by financing activities	(317.5)	121.7
Increase in cash and cash equivalents	9.6	24.7
Cash and cash equivalents at beginning of year	32.4	75.2
Cash and cash equivalents at end of period	$ 42.0	$ 99.9