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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash Flows from Operating Activities:    
Net income $ 399.7 $ 338.9
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization of intangibles 283.7 264.3
Amortization of deferred financing costs 6.0 5.8
Share-based compensation expense 15.4 15.0
Deferred income tax provision 1.6 6.5
Net loss on impairment of assets 13.5  
Pension and post retirement benefits expense, net of contributions (25.3) (33.5)
Other, net 12.0 3.7
(Increase) decrease in assets —    
Accounts receivable (142.2) (36.0)
Inventories (13.0) 4.1
Prepaid expenses and other current assets (10.3) (11.2)
Increase (decrease) in liabilities —    
Accounts payable 37.7 13.6
Accrued liabilities 9.6 10.8
Federal and state income taxes payable / receivable (5.1) 11.5
Net cash provided by operating activities 583.3 593.5
Cash Flows from Investing Activities:    
Additions to property, plant, and equipment (226.2) (188.1)
Acquisition of business, net of cash acquired   (385.6)
Additions to other long term assets (6.9) (9.4)
Proceeds from disposals 4.4  
Other, net 1.1 0.4
Net cash used for investing activities (227.6) (582.7)
Cash Flows from Financing Activities:    
Repayments of debt and capital lease obligations (35.6) (30.7)
Proceeds from issuance of debt   385.0
Financing costs paid   (2.1)
Common stock dividends paid (178.2) (156.7)
Repurchases of common stock   (100.3)
Shares withheld to cover employee restricted stock taxes (10.7) (10.2)
Other, net   (0.2)
Net cash (used for) provided by financing activities (224.5) 84.8
Net increase in cash and cash equivalents 131.2 95.6
Cash and cash equivalents, beginning of period 239.3  
Cash and cash equivalents, end of period $ 370.5 $ 279.8