Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jul. 03, 2025	Dec. 31, 2024
Assets
Cash and cash equivalents	$ 369.6	$ 537.0
Restricted Cash, Current	0.0	0.0
Accounts receivable, net	323.2	395.3
Unbilled Receivables, Current	464.6	777.9
Inventory, net	1,345.1	1,891.7
Disposal Group, Including Discontinued Operation, Assets	1,214.9	100.6
Other current assets	51.2	58.0
Total current assets	3,768.6	3,760.5
Property, plant and equipment, net	1,496.8	1,947.9
Operating Lease, Right-of-Use Asset	70.8	79.0
Pension assets	59.3	49.4
Pension reversion assets	13.4	41.2
Deferred Income Tax Assets, Net	0.0	0.1
Goodwill	630.3	630.0
Intangible Assets, Net (Excluding Goodwill)	120.1	149.5
Deferred income taxes	78.8	105.2
Other assets	6,238.1	6,762.8
Liabilities, Current [Abstract]
Accounts Payable, Current	852.4	1,041.1
Accrued Liabilities, Current	403.8	453.3
Deferred Compensation Liability, Current	36.5	59.0
Long-term Debt and Lease Obligation, Current	690.5	424.5
Operating Lease, Liability, Current	10.1	10.0
Customer Advances, Current	87.6	158.1
Contract with Customer, Liability, Current	150.4	270.3
Provision for Loss on Contracts	301.0	471.5
Deferred Credits and Other Liabilities, Current	8.7	75.4
Customer Advances and Deposits, Current	511.9	532.0
Disposal Group, Including Discontinued Operation, Liabilities	1,769.9	18.8
Other Liabilities, Current	56.4	53.4
Liabilities Noncurrent
Long-term debt	3,653.4	3,969.7
Operating Lease, Liability, Noncurrent	64.9	69.8
Advance payments, long-term	152.1	181.0
Pension/OPEB obligation	23.2	24.9
Contract with Customer, Liability, Noncurrent	164.2	177.4
Provision for Loss on Contacts, Non Current	307.5	799.8
Deferred Credits and Other Liabilities, Noncurrent	11.8	46.7
Deferred grant income liability - non-current	22.8	25.1
Deferred Income Tax Liabilities, Net	13.8	7.8
Other Long-Term Debt	502.3	372.0
Deferred income taxes	232.6	137.2
Stockholders' Equity Attributable to Parent [Abstract]
Common stock	1.2	1.2
Additional Paid in Capital [Abstract]
Additional paid-in capital	1,472.0	1,457.6
AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract
Accumulated other comprehensive loss	(44.7)	(100.1)
Retained Earnings Accumulated Deficit [Abstract]
Retained earnings (deficit)	$ (2,767.4)	$ (1,523.5)
Treasury Stock, Shares	41,587,480	41,587,480
Treasury Stock, Value	$ (2,456.7)	$ (2,456.7)
Total stockholders’ equity (deficit)	(3,795.6)	(2,621.5)
Noncontrolling interest	5.9	5.5
Total equity (deficit)	(3,789.7)	(2,616.0)
Total liabilities and equity	6,238.1	6,762.8
Liabilities, Current	$ 4,879.2	$ 3,567.4
Class A [Member]
Retained Earnings Accumulated Deficit [Abstract]
Common Stock, Shares Authorized	200,000,000	200,000,000
Class B [Member]
Retained Earnings Accumulated Deficit [Abstract]
Common Stock, Shares Authorized	150,000,000	150,000,000