Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash Flows from Operating Activities:
Net income	$ 774.1	$ 805.1	$ 765.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization of intangibles	652.8	525.6	517.7
Amortization of deferred financing costs	5.3	2.3	2.2
Share-based compensation expense	45.2	48.8	40.0
Deferred income tax provision (benefit)	97.3	(4.2)	5.2
Net loss on asset disposals	29.4	19.5	9.1
Pension and post-retirement benefits expense, net of contributions	8.0	(19.5)	(30.8)
Other, net	0.1	24.2	13.3
(Increase) decrease in assets -
Accounts receivable	(10.3)	(110.7)	(1.4)
Inventories	4.4	(111.8)	(35.8)
Prepaid expenses and other current assets	82.9	(104.7)	(4.2)
Increase (decrease) in liabilities —
Accounts payable	(42.5)	18.3	11.4
Accrued liabilities	(71.2)	104.2	(8.2)
Federal and state income tax payable / receivable	(18.0)	(5.9)	31.4
Net cash provided by operating activities	1,557.5	1,191.2	1,315.1
Cash Flows from Investing Activities:
Additions to property, plant, and equipment	(828.9)	(669.7)	(469.7)
Acquisition of business, net of cash acquired	(1,804.3)	0.0	0.0
Additions to other long-term assets	(2.4)	(1.9)	(2.6)
Proceeds from asset disposals	33.4	1.3	1.6
Purchases of held-to-maturity debt securities	0.0	0.0	(400.0)
Proceeds from maturities of held-to-maturity debt securities	0.0	400.0	0.0
Purchases of available-for-sale debt securities	(113.5)	(114.3)	(107.2)
Proceeds from sales of available-for-sale debt securities	41.1	8.6	5.5
Proceeds from maturities of available-for-sale debt securities	101.7	98.2	97.3
Net cash used for investing activities	(2,572.9)	(277.8)	(875.1)
Cash Flows from Financing Activities:
Repayments of debt and finance lease obligations	(2.2)	(401.9)	(1.9)
Proceeds from issuance of debt, net of discount and lender fees	1,494.1	0.0	397.1
Financing costs paid	(6.3)	0.0	(1.1)
Common stock dividends paid	(449.6)	(448.8)	(448.9)
Repurchases of common stock	(153.0)	0.0	(41.5)
Shares withheld to cover employee restricted stock taxes	(23.6)	(25.7)	(15.7)
Net cash provided by (used for) financing activities	859.4	(876.4)	(112.0)
Net (decrease) increase in cash and cash equivalents	(156.0)	37.0	328.0
Cash and cash equivalents, beginning of year	685.0	648.0	320.0
Cash and cash equivalents, end of year	$ 529.0	$ 685.0	$ 648.0