Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Consolidated net earnings	$ 721.1	$ 612.0	$ 470.4
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	393.5	371.5	344.0
Stock-based compensation expense	30.0	34.1	29.3
Gains on divestitures and sales of assets	(73.0)	(3.1)	(39.3)
Deferred income taxes, net	43.8	29.4	85.1
Noncash portion of asset and portfolio rationalization charge			17.0
Other items, net	2.1	8.6	(9.0)
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	6.1	(50.4)	(10.6)
Inventories, net	(19.3)	(27.7)	(22.0)
Accounts payable	(34.0)	25.9	20.1
Other assets and liabilities, net	(20.2)	(34.2)	(179.9)
Net Cash Provided by Operating Activities	1,050.1	966.1	705.1
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(359.7)	(393.5)	(376.0)
Acquisitions, net of cash acquired	(65.1)		(1,642.1)
Proceeds from divestitures and sales of assets	142.3	8.4	69.1
Payment of railcar construction advances			(79.4)
Reimbursement of railcar construction advances			79.4
Investments in life insurance contracts, net	(111.2)	0.6	0.8
Other investing activities, net	(16.0)	(1.4)
Net Cash Used for Investing Activities	(409.7)	(385.9)	(1,948.2)
Cash Flows from Financing Activities:
Borrowings of long-term debt	628.1	625.0	1,000.0
Repayments of long-term debt	(777.1)	(975.1)	(910.1)
Debt issuance costs	(2.0)		(3.9)
Payments on finance lease obligations	(3.5)	(11.0)
Payments on capital lease obligations			(3.5)
Dividends paid	(140.3)	(129.8)	(116.4)
Repurchases of common stock	(50.0)	(98.2)	(100.4)
Payments of deferred acquisition consideration			(6.7)
Purchase of the noncontrolling interest in the existing joint venture			(12.8)
Distributions to owners of noncontrolling interest		(0.6)
Proceeds from exercise of stock options	2.3	13.7	7.3
Shares withheld for employees’ income tax obligations	(14.5)	(28.1)	(11.9)
Net Cash Used for Financing Activities	(357.0)	(604.1)	(158.4)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	283.4	(23.9)	(1,401.5)
Cash, Cash Equivalents and Restricted Cash, beginning of year	21.0	44.9	1,446.4
Cash, Cash Equivalents and Restricted Cash, end of year	$ 304.4	$ 21.0	$ 44.9