Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 1,873.3	$ 2,350.5
Restricted Cash, Current	0.3	0.3
Accounts receivable, net	484.4	546.4
Unbilled Receivables, Current	368.4	528.3
Inventory, net	1,422.3	1,118.8
Other current assets	336.3	98.7
Total current assets	4,485.0	4,643.0
Property, plant and equipment, net	2,503.8	2,271.7
Operating Lease, Right-of-Use Asset	70.6	48.9
Unbilled Receivable, Non Current	4.4	6.4
Pension assets	455.9	449.1
Deferred tax asset-non-current, net	0.1	106.5
Other assets	83.6	76.8
Total assets	8,383.9	7,606.0
Liabilities
Accounts payable	558.9	1,058.3
Accrued expenses	365.6	240.2
Profit sharing	57.0	84.5
Current portion of long-term debt	340.7	50.2
Operating Lease, Liability, Current	5.5	6.0
Advance payments, short-term	18.9	21.6
Contract with Customer, Liability, Current	97.6	158.3
Provision for Loss on Contracts	184.6	83.9
Deferred revenue and other deferred credits, short-term	22.2	14.8
Deferred grant income liability — current	0.0	3.6
Other current liabilities	58.4	39.3
Total current liabilities	1,709.4	1,760.7
Long-term debt	3,532.9	2,984.1
Operating Lease, Liability, Noncurrent	66.6	43.0
Advance payments, long-term	327.4	333.3
Pension/OPEB obligation	440.2	35.7
Contract with Customer, Liability, Noncurrent	372.0	356.3
Provision for Loss on Contacts, Non Current	561.4	163.5
Deferred grant income liability — non-current	28.1	29.0
Deferred Tax Liabilities, Net, Noncurrent	13.0	8.3
Deferred revenue and other deferred credits	38.9	34.4
Other non-current liabilities	437.0	95.8
Stockholders’ Equity
Preferred stock, par value $0.01, 10,000,000 shares authorized, no shares issued	0.0	0.0
Additional paid-in capital	1,139.8	1,125.0
Accumulated other comprehensive loss	(154.1)	(109.2)
Retained earnings	2,326.4	3,201.3
Treasury Stock, Value	(2,456.7)	(2,456.8)
Total stockholders' equity	856.5	1,761.4
Noncontrolling interest	0.5	0.5
Total equity	857.0	1,761.9
Total liabilities and equity	8,383.9	7,606.0
Goodwill	565.3	2.4
Intangible Assets, Net (Excluding Goodwill)	215.2	1.2
Class A [Member]
Stockholders’ Equity
Common stock	$ 1.1	$ 1.1