Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016
Cash flow from operating activities:
Net Income	$ 156.1	$ 94.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	26.4	27.9
Amortization expense	109.1	117.2
Provision for doubtful accounts	1.2	2.5
Deferred income taxes	(0.2)	1.2
Stock-based compensation	45.0	40.0
Income from equity method investments	(22.8)	(13.9)
Divestiture (gain) loss, net	(8.0)	0.1
Provision for excess and obsolete inventories	3.6	12.0
Other non-cash items	(1.5)	3.9
Decrease (increase) in assets:
Accounts receivable	(34.2)	(9.9)
Other receivables	0.7	(2.7)
Inventories	(19.4)	25.7
Other current and non-current assets	(21.9)	(11.1)
Increase (decrease) in liabilities:
Accounts payable	27.8	2.7
Accrued compensation and benefits	7.5	(12.8)
Deferred revenue	29.6	32.8
Accrued warranty	0.1	(0.5)
Other liabilities	10.9	(22.6)
Net cash provided by operating activities	310.0	287.0
Cash flow from investing activities:
Acquisitions of businesses, net of cash acquired	(286.7)	(22.3)
Acquisitions of property and equipment	(26.4)	(19.7)
Purchases of equity method investments	0.0	(1.5)
Acquisitions of intangible assets	0.0	(0.3)
Purchases of short-term investments	(220.0)	(62.1)
Proceeds from maturities of short-term investments	84.6	0.0
Proceeds from sales of short-term investments	92.1	0.0
Net proceeds from sales of businesses	20.1	10.7
Dividends received from equity method investments	12.9	16.5
Other	0.5	0.1
Net cash used in investing activities	(322.9)	(78.6)
Cash flow from financing activities:
Issuance of common stock, net of tax withholdings	73.0	50.0
Repurchases and retirement of common stock	(111.5)	(102.2)
Proceeds from debt and revolving credit lines	517.0	291.0
Payments on debt and revolving credit lines	(444.3)	(351.3)
Net cash provided by (used in) financing activities	34.2	(112.5)
Effect of exchange rate changes on cash and cash equivalents	17.6	1.6
Net increase in cash and cash equivalents	38.9	97.5
Cash and cash equivalents - beginning of period	216.1	116.0
Cash and cash equivalents - end of period	$ 255.0	$ 213.5