Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 610.9	$ 700.4
Restricted cash	3.0	3.0
Marketable securities	10.1	10.6
Accounts receivable	143.4	60.6
Contract assets	372.0	354.2
Other current assets	93.6	99.5
Total Current Assets	1,233.0	1,228.3
Noncurrent Assets
Right-of-use assets	49.8	52.6
Property, plant and equipment, net	413.3	421.1
Recoverable environmental remediation costs	220.7	226.2
Deferred income taxes	101.5	55.6
Goodwill	161.4	161.4
Intangible assets	33.1	34.9
Other noncurrent assets	236.3	243.3
Total Noncurrent Assets	1,216.1	1,195.1
Total Assets	2,449.1	2,423.4
Current Liabilities
Current portion of long-term debt	177.3	166.7
Accounts payable	115.1	132.2
Reserves for environmental remediation costs	41.2	37.7
Contract liabilities	366.7	366.5
Other current liabilities	213.1	172.7
Total Current Liabilities	913.4	875.8
Noncurrent Liabilities
Long-term debt	285.7	294.6
Reserves for environmental remediation costs	252.5	258.7
Pension benefits	242.9	255.9
Operating lease liabilities	38.8	41.3
Other noncurrent liabilities	165.9	173.8
Total Noncurrent Liabilities	985.8	1,024.3
Total Liabilities	1,899.2	1,900.1
Commitments and contingencies
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; 80.3 million shares outstanding as of March 31, 2022; 80.1 million shares outstanding as of December 31, 2021	8.0	8.0
Other capital	572.7	578.1
Treasury stock at cost, 2.1 million shares as of March 31, 2022 and December 31, 2021	(64.4)	(64.4)
Retained earnings	129.4	102.6
Accumulated other comprehensive loss, net of income taxes	(95.8)	(101.0)
Total Stockholders’ Equity	549.9	523.3
Total Liabilities and Stockholders’ Equity	$ 2,449.1	$ 2,423.4