Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Cash flow from operating activities:
Net income	$ 62.4	$ 58.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	10.2	8.5
Amortization expense	44.3	40.5
Deferred income taxes	1.1	(10.8)
Stock-based compensation	16.3	17.4
Income from equity method investments	(4.8)	(0.1)
Other non-cash items	1.8	(11.1)
(Increase) decrease in assets:
Accounts receivable, net	(13.8)	(29.4)
Inventories	(6.8)	(21.7)
Other current and non-current assets	6.1	(1.1)
Increase (decrease) in liabilities:
Accounts payable	3.4	11.1
Accrued compensation and benefits	(57.0)	(41.6)
Deferred revenue	77.1	69.6
Other current and non-current liabilities	7.3	(7.1)
Net cash provided by operating activities	147.6	82.9
Cash flow from investing activities:
Acquisitions of businesses, net of cash acquired		(518.7)
Proceeds from Previous Acquisition	4.9
Acquisitions of property and equipment	(14.5)	(18.2)
Purchases of short-term investments	0.0	(24.0)
Proceeds from maturities of short-term investments	0.0	6.2
Proceeds from sales of short-term investments	0.0	196.8
Other	0.0	4.4
Net cash used in investing activities	(9.6)	(353.5)
Cash flow from financing activities:
Issuance of common stock, net of tax withholdings	25.6	25.3
Repurchases of common stock	(40.0)	(53.0)
Proceeds from debt and revolving credit lines	266.9	591.0
Payments on debt and revolving credit lines	(339.7)	(383.0)
Other	(7.1)	0.0
Net cash provided by (used in) financing activities	(94.3)	180.3
Effect of exchange rate changes on cash and cash equivalents	0.5	6.3
Net increase (decrease) in cash and cash equivalents	44.2	(84.0)
Cash and cash equivalents - beginning of period	172.5	358.5
Cash and cash equivalents - end of period	$ 216.7	$ 274.5