Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net earnings	$ 44.4	$ 35.4
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	21.2	25.6
Deferred income taxes	1.1	1.2
Share-based compensation	2.9	2.3
Loss on disposal of discontinued operations	0.0	0.4
Equity earnings from joint venture	(18.2)	(21.0)
U.S. pension (credit)	(0.2)	0.0
Loss from change in fair value of contingent consideration	0.1	0.2
Payments of contingent consideration in excess of acquisition-date fair value	(1.9)	0.0
Other non-cash adjustments, net	0.2	0.2
Changes in operating assets and liabilities:
Receivables	(13.1)	(12.9)
Inventories	(13.6)	(2.1)
Accounts payable and accrued expenses	(17.5)	(9.2)
Income taxes receivable and payable, net	13.0	5.5
Other assets and liabilities	(1.7)	(6.0)
Net cash provided by operating activities	16.7	19.6
Cash flows from investing activities:
Purchases of property, plant and equipment	(12.0)	(13.2)
Return of investment from joint venture	12.2	16.5
Payments to Knauf upon disposal of discontinued operations	0.0	(11.8)
Other investing activities	0.0	(0.3)
Net cash provided by (used for) investing activities	0.2	(8.8)
Cash flows from financing activities:
Proceeds from revolving credit facility	25.0	50.0
Payments of revolving credit facility	(10.0)	(50.0)
Payments of long-term debt	(6.2)	(6.3)
Dividends paid	(10.9)	(10.1)
Proceeds from share-based compensation plans, net of tax	0.2	0.7
Payments for finance leases	(0.6)	(0.5)
Payments of acquisition-related contingent consideration	(6.7)	0.0
Payments for treasury stock acquired	(30.0)	(10.0)
Net cash (used for) financing activities	(39.2)	(26.2)
Effect of exchange rate changes on cash and cash equivalents	0.3	0.1
Net (decrease) in cash and cash equivalents	(22.0)	(15.3)
Cash and cash equivalents at beginning of year	98.1	136.9
Cash and cash equivalents at end of period	76.1	121.6
Supplemental Cash Flow Disclosures:
Interest paid	4.9	5.7
Income tax payments, net	0.9	7.2
Amounts in accounts payable for capital expenditures	$ 0.3	$ 0.7