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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash Flows from Operating Activities:    
Net income $ 326.7 $ 260.6
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization of intangibles 212.2 186.2
Amortization of deferred financing costs 4.4 4.0
Share-based compensation expense 10.7 10.2
Deferred income tax provision 30.1 3.9
Pension and post-retirement benefits expense, net of contributions 9.0 4.9
Other, net 3.8 0.7
Increase in assets —    
Accounts receivable (82.7) (66.1)
Inventories (5.7) (10.8)
Prepaid expenses and other current assets (19.2) (20.0)
Increase (decrease) in liabilities —    
Accounts payable 11.0 18.8
Accrued liabilities (19.7) (24.1)
Federal and state income taxes payable / receivable 52.9 17.3
Net cash provided by operating activities 533.5 385.6
Cash Flows from Investing Activities:    
Additions to property, plant, and equipment (273.9) (139.4)
Additions to other long term assets (2.7) (5.5)
Proceeds from disposals 0.5 2.9
Other, net 2.6 1.1
Net cash used for investing activities (273.5) (140.9)
Cash Flows from Financing Activities:    
Repayments of debt and capital lease obligations (150.7) (33.7)
Common stock dividends paid (118.9) (118.8)
Shares withheld to cover employee restricted stock taxes (7.7) (10.5)
Net cash used for financing activities (277.3) (163.0)
Net (decrease) increase in cash and cash equivalents (17.3) 81.7
Cash and cash equivalents, beginning of period 216.9 239.3
Cash and cash equivalents, end of period $ 199.6 $ 321.0