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:
Net earnings	$ 59.5	$ 62.5	$ 68.8
Adjustments to reconcile net earnings to net cash flows provided by operating activities:
Depreciation, depletion and amortization	137.9	137.9	136.9
Finance fee amortization	3.2	2.8	2.2
Refinancing of long-term debt	0.1	0.3	0.0
Stock-based compensation	9.4	6.3	7.8
Deferred income taxes	5.4	(11.8)	(16.7)
Net earnings in equity investee	(1.4)	(0.7)	(1.0)
Unrealized foreign exchange (gain) loss	(2.8)	15.0	0.1
Other, net	6.8	7.2	4.1
Changes in operating assets and liabilities:
Receivables	19.5	(31.3)	16.4
Inventories	(71.4)	(45.4)	(16.8)
Other assets	21.1	23.9	(18.4)
Accounts payable and accrued expenses and other current liabilities	(3.7)	(12.1)	21.1
Other liabilities	(8.4)	5.0	(22.2)
Net cash provided by operating activities	175.2	159.6	182.3
Cash flows from investing activities:
Capital expenditures	(84.9)	(98.1)	(96.8)
Other, net	(3.3)	(2.3)	(2.8)
Net cash used in investing activities	(88.2)	(100.4)	(99.6)
Cash flows from financing activities:
Proceeds from revolving credit facility borrowings	300.0	574.1	457.4
Principal payments on revolving credit facility borrowings	(329.7)	(611.1)	(429.1)
Proceeds from issuance of long-term debt	115.8	1,001.8	54.3
Principal payments on long-term debt	(79.2)	(902.8)	(68.1)
Dividends paid	(99.1)	(98.1)	(97.7)
Deferred financing costs	(1.0)	(12.8)	(1.7)
Shares withheld to satisfy employee tax obligations	(1.1)	(0.3)	0.0
Other, net	(1.9)	(1.3)	(1.0)
Net cash used in financing activities	(96.2)	(50.5)	(85.9)
Effect of exchange rate changes on cash and cash equivalents	(4.5)	(1.0)	(6.4)
Net change in cash and cash equivalents	(13.7)	7.7	(9.6)
Cash and cash equivalents, beginning of the year	34.7	27.0	36.6
Cash and cash equivalents, end of period	21.0	34.7	27.0
Supplemental cash flow information:
Interest paid, net of amounts capitalized	65.0	60.7	52.1
Income taxes paid, net of refunds	$ (10.3)	$ 33.9	$ 38.3