Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2018	Mar. 30, 2017
Operating activities
Net income	$ 125.4	$ 141.7
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation expense	56.8	52.5
Amortization of deferred financing fees	0.8	0.8
Accretion of customer supply agreement	1.2	2.9
Employee stock compensation expense	7.1	8.0
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(1.7)	0.0
(Gain) loss from foreign currency transactions	(1.6)	0.5
Gain (Loss) on Disposition of Property Plant Equipment	(0.2)	0.0
Deferred taxes	(1.2)	24.5
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits	(8.7)	(8.7)
Grant liability amortization	(5.1)	(4.1)
Equity in net income of affiliate	(0.6)	(0.1)
Increase (Decrease) in Forward Provision	(36.9)	0.0
Changes in assets and liabilities
Accounts receivable	(96.6)	(158.1)
Inventory, net	45.3	46.1
Increase (Decrease) in Unbilled Receivables	(70.0)	0.0
Accounts payable and accrued liabilities	177.8	113.2
Profit sharing/deferred compensation	(93.1)	(80.5)
Advance payments	(25.3)	(52.5)
Income taxes receivable/payable	25.9	39.4
Increase (Decrease) in Billing in Excess of Cost of Earnings	77.1	0.0
Deferred revenue and other deferred credits	2.6	(6.3)
Other	(12.4)	(7.6)
Net cash provided by operating activities	166.6	111.7
Investing activities
Purchase of property, plant and equipment	(48.2)	(40.6)
Payments for (Proceeds from) Other Investing Activities	0.2	0.0
Net cash used in investing activities	(48.0)	(40.6)
Financing activities
Principal payments of debt	(1.7)	(0.8)
Repayments of Debt	(6.2)	0.0
Repayments of Senior Debt	(6.2)
Payments Related to Tax Withholding for Share-based Compensation	(12.7)	(4.1)
Debt issuance and financing costs	0.0	(1.0)
Proceeds from Other Debt	0.0	7.6
Payments for Repurchase of Common Stock	(73.8)	(81.5)
Payments of Dividends	(11.5)	12.0
Net cash used in financing activities	(105.9)	(91.8)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.7
Net increase (decrease) in cash, cash equivalents, and restricted cash for the period	12.7	(20.0)
Cash, cash equivalents, and restricted cash, beginning of period	445.5	717.6
Cash, cash equivalents, and restricted cash, end of period	$ 437.9	$ 672.2