Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net earnings	$ 96.6	$ 90.5
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	42.1	51.3
Deferred income taxes	(0.3)	5.4
Share-based compensation	7.3	5.5
Loss on disposal of discontinued operations	0.0	0.4
Equity earnings from joint venture	(39.5)	(44.7)
U.S. pension (credit) cost	(0.4)	0.1
Loss (gain) related to change in fair value of contingent consideration	6.2	(9.5)
Payments of contingent consideration in excess of acquisition-date fair value	(1.9)	0.0
Other non-cash adjustments, net	0.4	0.5
Changes in operating assets and liabilities:
Receivables	(27.2)	(14.3)
Inventories	(18.6)	(3.3)
Accounts payable and accrued expenses	4.4	8.2
Income taxes receivable and payable, net	(3.4)	2.6
Other assets and liabilities	(2.6)	(10.8)
Net cash provided by operating activities	63.1	81.9
Cash flows from investing activities:
Purchases of property, plant and equipment	(27.9)	(30.7)
Return of investment from joint venture	26.3	36.4
Payments to Knauf upon disposal of discontinued operations	0.0	(11.8)
Other investing activities	0.0	(0.7)
Net cash (used for) investing activities	(1.6)	(6.8)
Cash flows from financing activities:
Proceeds from revolving credit facility	75.0	75.0
Payments of revolving credit facility	(25.0)	(100.0)
Payments of long-term debt	(12.5)	(12.5)
Dividends paid	(22.0)	(20.4)
Payments from share-based compensation plans, net of tax	(2.9)	(4.5)
Payments for finance leases	(1.1)	(1.0)
Payments of acquisition related contingent consideration	(6.7)	0.0
Payments for treasury stock acquired	(85.0)	(30.0)
Net cash (used for) financing activities	(80.2)	(93.4)
Effect of exchange rate changes on cash and cash equivalents	(0.1)	0.4
Net (decrease) in cash and cash equivalents	(18.8)	(17.9)
Cash and cash equivalents at beginning of year	98.1	136.9
Cash and cash equivalents at end of period	79.3	119.0
Supplemental Cash Flow Disclosures:
Interest paid	10.3	11.1
Income tax payments, net	33.7	25.1
Amounts in accounts payable for capital expenditures	$ 0.3	$ 1.9