Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 272.5	$ 322.1
Restricted cash	3.1	3.1
Marketable securities	11.2	10.5
Accounts receivable	177.4	126.6
Contract assets	417.0	451.1
Other current assets	116.8	155.6
Total Current Assets	998.0	1,069.0
Noncurrent Assets
Right-of-use assets	51.4	54.5
Property, plant and equipment, net	411.9	420.2
Recoverable environmental remediation costs	216.1	221.5
Deferred income taxes	240.1	208.7
Goodwill	161.4	161.4
Intangible assets	26.6	28.3
Other noncurrent assets	207.5	208.2
Total Noncurrent Assets	1,315.0	1,302.8
Total Assets	2,313.0	2,371.8
Current Liabilities
Current portion of long-term debt	14.8	14.7
Accounts payable	122.8	142.1
Reserves for environmental remediation costs	37.9	36.9
Contract liabilities	307.6	334.7
Other current liabilities	167.2	218.7
Total Current Liabilities	650.3	747.1
Noncurrent Liabilities
Long-term debt	284.9	288.4
Reserves for environmental remediation costs	247.4	253.6
Pension benefits	227.2	229.3
Operating lease liabilities	44.5	46.2
Other noncurrent liabilities	295.9	265.9
Total Noncurrent Liabilities	1,099.9	1,083.4
Total Liabilities	1,750.2	1,830.5
Commitments and contingencies (Note 8)
Stockholders’ Equity
Preferred stock, par value of $1.00; 15.0 million shares authorized; none issued or outstanding	0.0	0.0
Common stock, par value of $0.10; 150.0 million shares authorized; 80.6 million shares outstanding as of March 31, 2023; 80.7 million shares outstanding as of December 31, 2022	8.1	8.0
Other capital	501.0	507.2
Treasury stock at cost, 2.0 million shares as of March 31, 2023 and December 31, 2022	(63.0)	(63.0)
Retained earnings	204.8	176.6
Accumulated other comprehensive loss, net of income taxes	(88.1)	(87.5)
Total Stockholders’ Equity	562.8	541.3
Total Liabilities and Stockholders’ Equity	$ 2,313.0	$ 2,371.8