Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net income	$ 1,029,800,000	$ 841,100,000	$ 461,000,000.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization of intangibles	456,800,000	417,500,000	409,900,000
Amortization of deferred financing costs	2,100,000	4,400,000	2,600,000
Loss on early extinguishment of debt	0	56,100,000	0
Share-based compensation expense	35,600,000	35,500,000	30,000,000.0
Deferred income tax provision	86,000,000.0	59,400,000	34,700,000
Goodwill impairment	0	0	55,200,000
Net loss on asset disposals	15,200,000	6,100,000	6,800,000
Pension and post-retirement benefits expense, net of contributions	(47,400,000)	(50,500,000)	(63,400,000)
Other, net	2,000,000.0	11,900,000	18,200,000
(Increase) decrease in assets -
Accounts receivable	39,300,000	(227,200,000)	13,200,000
Inventories	(75,200,000)	(105,500,000)	6,300,000
Prepaid expenses and other current assets	(11,000,000.0)	(2,700,000)	400,000
Increase (decrease) in liabilities —
Accounts payable	(18,100,000)	12,200,000	39,700,000
Accrued liabilities	8,300,000	37,900,000	(3,200,000)
Federal and state income tax payable / receivable	(28,400,000)	(2,100,000)	21,400,000
Net cash provided by operating activities	1,495,000,000.0	1,094,100,000	1,032,800,000
Cash Flows from Investing Activities:
Additions to property, plant, and equipment	(824,200,000)	(605,100,000)	(421,200,000)
Acquisitions of businesses, net of cash acquired	0	(194,900,000)	0
Additions to other long-term assets	(6,200,000)	(1,800,000)	(6,400,000)
Proceeds from asset disposals	2,200,000	7,900,000	4,600,000
Purchases of marketable debt securities	(126,100,000)	(127,400,000)	(110,100,000)
Proceeds from sales of marketable debt securities	31,100,000	26,700,000	24,200,000
Proceeds from maturities of marketable debt securities	87,600,000	100,200,000	82,800,000
Other, net	1,900,000	0	0
Net cash used for investing activities	(833,700,000)	(794,400,000)	(426,100,000)
Cash Flows from Financing Activities:
Net proceeds received from issuance of debt	0	690,200,000	0
Repayments of debt and finance lease obligations	(1,700,000)	(757,700,000)	(1,500,000)
Financing costs paid	0	(2,400,000)	0
Common stock dividends paid	(420,300,000)	(379,800,000)	(299,600,000)
Repurchases of common stock	(522,600,000)	(193,000,000.0)	0
Shares withheld to cover employee restricted stock taxes	(15,400,000)	(12,900,000)	(10,500,000)
Net cash used for financing activities	(960,000,000.0)	(655,600,000)	(311,600,000)
Net increase in cash and cash equivalents	(298,700,000)	(355,900,000)	295,100,000
Cash and cash equivalents, beginning of year	618,700,000	974,600,000	679,500,000
Cash and cash equivalents, end of year	$ 320,000,000.0	$ 618,700,000	$ 974,600,000