Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 27, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 683.4	$ 423.3
Restricted Cash and Cash Equivalents	0.3	2.2
Accounts receivable, net	685.1	722.2
Unbilled Receivables, Current	513.2	0.0
Inventory, net	931.0	1,449.9
Other current assets	35.4	53.5
Total current assets	2,848.4	2,651.1
Property, plant and equipment, net	2,123.0	2,105.3
Unbilled Receivable, Non Current	53.5	0.0
Pension assets	372.3	347.1
Other assets	284.9	164.3
Total assets	5,682.1	5,267.8
Liabilities
Accounts payable	882.4	693.1
Accrued expenses	354.0	269.3
Profit sharing	42.0	109.5
Current portion of long-term debt	25.0	31.1
Advance payments, short-term	112.7	100.0
Billings in Excess of Cost, Current	153.5	0.0
Provision for Loss on Contracts	147.3	0.0
Deferred revenue and other deferred credits, short-term	7.1	64.6
Deferred grant income liability - current	19.4	21.6
Other current liabilities	68.8	331.8
Total current liabilities	1,812.2	1,621.0
Liabilities Noncurrent
Long-term debt	1,869.7	1,119.9
Advance payments, long-term	146.4	231.7
Pension/OPEB obligation	38.4	40.8
Billings in Excess of Cost, Noncurrent	353.8	0.0
Provision for Loss on Contacts, Non Current	72.6	0.0
Deferred grant income liability - non-current	30.7	39.3
Deferred revenue and other deferred credits	26.8	161.0
Other liabilities	215.1	252.6
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par value $0.01, 10,000,000 shares authorized, no shares issued	0.0	0.0
Additional Paid in Capital [Abstract]
Additional paid-in capital	983.4	1,086.9
AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract
Accumulated other comprehensive loss	(145.0)	(128.5)
Retained Earnings Accumulated Deficit [Abstract]
Retained earnings	2,548.7	2,422.4
Treasury Stock, Value	(2,272.3)	(1,580.9)
Total stockholders’ equity	1,115.9	1,801.0
Noncontrolling interest	0.5	0.5
Total equity	1,116.4	1,801.5
Total liabilities and equity	5,682.1	5,267.8
Class A [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Common stock	$ 1.1	$ 1.1