CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating Activities:
Net income (loss)	$ (75.0)	$ 15.9
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	26.5	23.6
Equity compensation expense	7.9	8.8
Deferred income taxes	(3.6)	(8.6)
Equity in undistributed income of unconsolidated joint ventures	0.0	(0.8)
Dividends received from unconsolidated joint ventures	0.0	1.2
Impairment charges	71.8	0.0
Other non-cash charges, net	0.4	0.1
Changes in assets and liabilities:
Accounts receivable	(0.1)	(4.3)
Proceeds from insurance related to operations	0.0	4.1
Contract assets	0.2	12.5
Inventories, net	(2.8)	0.9
Other current assets	(4.6)	(5.4)
Accounts payable and other accrued expenses	6.2	2.9
Other, net	(1.5)	0.1
Net cash provided by operating activities	25.4	51.0
Investing Activities:
Capital expenditures	(17.7)	(23.5)
Proceeds from the sale of marketable equity securities	1.0	0.0
Purchases of marketable equity securities	(0.1)	0.0
Proceeds from the sale of property, plant and equipment, net	13.4	0.0
Net cash used in investing activities	(3.4)	(23.5)
Financing Activities:
Repayment of debt principal and finance lease obligations	(0.8)	(30.2)
Payments of taxes related to net share settlement of equity awards	(1.4)	(1.2)
Proceeds from issuance of shares to employee stock purchase plan	0.7	0.9
Share repurchases	(28.1)	(7.9)
Net cash used in financing activities	(29.6)	(38.4)
Effect of exchange rate fluctuations on cash	5.0	(0.9)
Net decrease in cash and cash equivalents	(2.6)	(11.8)
Cash and cash equivalents at beginning of period	159.8	131.7
Cash and cash equivalents at end of period	157.2	119.9
Supplemental Disclosures:
Accrued capital additions	3.9	4.3
Interest, net of amounts capitalized	0.6	0.5
Income taxes, net of refunds	$ 13.4	$ 7.2