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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash Flows from Operating Activities:    
Net income $ 337.4 $ 560.2
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization of intangibles 309.0 288.6
Amortization of deferred financing costs 1.9 6.5
Share-based compensation expense 23.8 24.5
Deferred income tax provision 21.1 38.3
Loss on asset disposals 4.1 6.7
Goodwill impairment 55.2  
Pension and post-retirement benefits expense, net of contributions (68.1) (30.4)
Other, net 18.8 9.6
(Increase) decrease in assets —    
Accounts receivable (19.0) (30.3)
Inventories 16.5 (10.8)
Prepaid expenses and other current assets (5.6) (5.6)
Increase (decrease) in liabilities —    
Accounts payable (6.2) (2.3)
Accrued liabilities 29.0 15.4
Federal and state income taxes payable / receivable 43.8 7.8
Net cash provided by operating activities 761.7 878.2
Cash Flows from Investing Activities:    
Additions to property, plant, and equipment (253.5) (263.8)
Additions to other long term assets (6.2) (4.5)
Purchases of marketable debt securities, net of redemptions (0.6)  
Proceeds from disposals 4.4 1.4
Other, net   (1.4)
Net cash used for investing activities (255.9) (268.3)
Cash Flows from Financing Activities:    
Repayments of debt and finance lease obligations (1.1) (1.1)
Common stock dividends paid (224.6) (223.9)
Shares withheld to cover employee restricted stock taxes (10.5) (8.1)
Net cash used for financing activities (236.2) (233.1)
Net increase in cash and cash equivalents 269.6 376.8
Cash and cash equivalents, beginning of period 679.5 361.5
Cash and cash equivalents, end of period $ 949.1 $ 738.3