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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash Flows from Operating Activities:    
Net income $ 380.4 $ 326.7
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization of intangibles 190.7 212.2
Amortization of deferred financing costs 4.3 4.4
Share-based compensation expense 18.6 10.7
Deferred income tax provision 26.9 30.1
Loss on asset disposals 1.9 3.3
Pension and post-retirement benefits expense, net of contributions 11.3 9.0
Other, net 8.7 0.5
Increase in assets —    
Accounts receivable (44.9) (82.7)
Inventories (20.1) (5.7)
Prepaid expenses and other current assets (21.2) (19.2)
Increase (decrease) in liabilities —    
Accounts payable (1.8) 11.0
Accrued liabilities (22.3) (19.7)
Federal and state income taxes payable / receivable 5.9 52.9
Net cash provided by operating activities 538.4 533.5
Cash Flows from Investing Activities:    
Additions to property, plant, and equipment (170.9) (273.9)
Additions to other long term assets (1.8) (2.7)
Proceeds from disposals 1.2 0.5
Other, net (1.3) 2.6
Net cash used for investing activities (172.8) (273.5)
Cash Flows from Financing Activities:    
Repayments of debt and finance lease obligations (0.7) (150.7)
Common stock dividends paid (149.3) (118.9)
Shares withheld to cover employee restricted stock taxes (7.7) (7.7)
Net cash used for financing activities (157.7) (277.3)
Net increase (decrease) in cash and cash equivalents 207.9 (17.3)
Cash and cash equivalents, beginning of period 361.5 216.9
Cash and cash equivalents, end of period $ 569.4 $ 199.6