Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 334.5	$ 700.4
Restricted cash	3.0	3.0
Marketable securities	9.2	10.6
Accounts receivable	134.0	60.6
Contract assets	403.3	354.2
Other current assets	117.7	99.5
Total Current Assets	1,001.7	1,228.3
Noncurrent Assets
Right-of-use assets	49.5	52.6
Property, plant and equipment, net	413.3	421.1
Recoverable environmental remediation costs	221.5	226.2
Deferred income taxes	189.3	55.6
Goodwill	161.4	161.4
Intangible assets	29.8	34.9
Other noncurrent assets	207.1	243.3
Total Noncurrent Assets	1,271.9	1,195.1
Total Assets	2,273.6	2,423.4
Current Liabilities
Current portion of long-term debt	14.7	166.7
Accounts payable	117.0	132.2
Reserves for environmental remediation costs	39.5	37.7
Contract liabilities	351.1	366.5
Other current liabilities	280.6	172.7
Total Current Liabilities	802.9	875.8
Noncurrent Liabilities
Long-term debt	292.1	294.6
Reserves for environmental remediation costs	253.9	258.7
Pension benefits	223.1	255.9
Operating lease liabilities	40.1	41.3
Other noncurrent liabilities	136.4	173.8
Total Noncurrent Liabilities	945.6	1,024.3
Total Liabilities	1,748.5	1,900.1
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; 80.4 million shares outstanding as of September 30, 2022; 80.1 million shares outstanding as of December 31, 2021	8.0	8.0
Other capital	505.1	578.1
Treasury stock at cost, 2.0 million shares as of September 30, 2022; 2.1 million shares as of December 31, 2021	(63.0)	(64.4)
Retained earnings	160.4	102.6
Accumulated other comprehensive loss, net of income taxes	(85.4)	(101.0)
Total Stockholders’ Equity	525.1	523.3
Total Liabilities and Stockholders’ Equity	$ 2,273.6	$ 2,423.4