Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 902.6	$ 932.6
Restricted cash	3.0	3.0
Accounts receivable, net	151.7	112.5
Contract assets	278.9	224.1
Other current assets, net	137.4	145.8
Total Current Assets	1,473.6	1,418.0
Noncurrent Assets
Right-of-use assets	53.5	48.0
Property, plant and equipment, net	403.2	409.9
Recoverable environmental remediation costs	228.1	234.8
Deferred income taxes	114.5	121.9
Goodwill	161.4	161.4
Intangible assets	54.7	58.2
Other noncurrent assets, net	251.5	255.6
Total Noncurrent Assets	1,266.9	1,289.8
Total Assets	2,740.5	2,707.8
Current Liabilities
Current portion of long-term debt	289.0	284.7
Accounts payable	128.4	127.3
Reserves for environmental remediation costs	41.7	40.1
Contract liabilities	288.6	262.3
Other current liabilities	134.4	155.5
Total Current Liabilities	882.1	869.9
Noncurrent Liabilities
Long-term debt	345.3	352.3
Reserves for environmental remediation costs	260.9	269.1
Pension benefits	394.3	398.9
Operating lease liabilities	43.9	39.1
Other noncurrent liabilities	197.2	201.8
Total Noncurrent Liabilities	1,241.6	1,261.2
Total Liabilities	2,123.7	2,131.1
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; 77.6 million shares issued and outstanding as of March 31, 2020; 77.3 million shares issued and outstanding as of December 31, 2019	7.7	7.7
Other capital	572.3	573.3
Treasury stock at cost, 0.8 million shares as of March 31, 2020 and December 31, 2019	(13.2)	(12.7)
Retained earnings	276.3	244.9
Accumulated other comprehensive loss, net of income taxes	(226.3)	(236.5)
Total Stockholders’ Equity	616.8	576.7
Total Liabilities and Stockholders’ Equity	$ 2,740.5	$ 2,707.8