Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net earnings	$ 151.3	$ 121.1
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	61.5	62.9
Deferred income taxes	9.2	53.0
Share-based compensation	9.2	8.1
Loss on disposal of discontinued operations	21.0	0.1
Equity earnings from joint venture	(59.2)	(51.9)
U.S. pension (credit) expense	(19.7)	2.0
Other non-cash adjustments, net	0.6	(0.6)
Changes in operating assets and liabilities:
Receivables	8.5	(27.4)
Inventories	(14.3)	(1.5)
Other current assets	3.6	(3.6)
Other non-current assets	(1.2)	(3.3)
Accounts payable and accrued expenses	(8.9)	(35.9)
Income taxes payable	9.3	(7.8)
Other long-term liabilities	(12.0)	(8.8)
Other, net	0.1	(1.5)
Net cash provided by operating activities	159.0	104.9
Cash flows from investing activities:
Purchases of property, plant and equipment	(40.7)	(63.2)
Return of investment from joint venture	88.9	52.8
Cash paid for acquisitions	(24.0)	(31.4)
Cash consideration received from Knauf	330.0
Payments of proceeds from Knauf to investment in joint venture	(70.0)
Other investing activities	1.7	0.5
Net cash provided by (used for) investing activities	285.9	(41.3)
Cash flows from financing activities:
Proceeds from revolving credit facility and other short-term debt		103.0
Payments of revolving credit facility and other short-term debt		(103.0)
Payments of long-term debt	(24.4)	(16.8)
Financing costs		(0.6)
Proceeds from exercised stock options	18.0	0.6
Payment for treasury stock acquired	(256.1)	(75.4)
Net cash (used for) financing activities	(262.5)	(92.2)
Effect of exchange rate changes on cash and cash equivalents	(5.0)	3.2
Net increase (decrease) in cash and cash equivalents	177.4	(25.4)
Cash and cash equivalents at beginning of year	159.6	141.9
Cash and cash equivalents at end of period	337.0	116.5
Cash and cash equivalents at end of period of discontinued operations	10.0
Cash and cash equivalents at end of period of continuing operations	327.0	116.5
Supplemental Cash Flow Disclosures:
Interest paid	24.6	23.1
Income tax payments, net	20.0	20.2
Amounts in accounts payable for capital expenditures	$ 0.6	$ 1.8