Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	[3]
Cash flow from operating activities:
Net income	$ 122.8	$ 97.1	[1],[2]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	17.2	17.7
Amortization expense	83.1	69.1	[4]
Stock-based compensation	34.3	28.9	[4]
Income from equity method investments	(1.5)	(9.0)
Other non-cash items	9.2	(9.5)
Decrease (increase) in assets:
Accounts receivable	(6.0)	(29.9)
Inventories	(21.8)	(2.0)
Other current and non-current assets	(16.8)	(9.7)
Increase (decrease) in liabilities:
Accounts payable	9.6	21.9
Accrued compensation and benefits	(6.6)	14.1
Deferred revenue	71.1	54.5
Other liabilities	(26.8)	10.2
Net cash provided by operating activities	267.8	253.4
Cash flow from investing activities:
Acquisitions of businesses, net of cash acquired	(532.9)	(124.9)
Acquisitions of property and equipment	(36.0)	(15.6)
Purchases of short-term investments	(24.0)	(137.6)
Proceeds from maturities of short-term investments	6.2	56.8
Proceeds from sales of short-term investments	196.8	90.6
Other	5.1	20.3
Net cash used in investing activities	(384.8)	(110.4)
Cash flow from financing activities:
Issuance of common stock, net of tax withholdings	21.7	49.8
Repurchases of common stock	(53.0)	(20.4)
Proceeds from debt and revolving credit lines	1,527.8	340.0
Payments on debt and revolving credit lines	(1,157.1)	(350.1)
Other	(1.8)	(4.6)
Net cash provided by financing activities	337.6	14.7
Effect of exchange rate changes on cash and cash equivalents	(8.1)	11.1
Net increase in cash and cash equivalents	212.5	168.8
Cash and cash equivalents - beginning of period	358.5	216.1
Cash and cash equivalents - end of period	$ 571.0	$ 384.9

[1] See Note 2 for a summary of adjustments

[2] See Note 2 for a summary of adjustments

[3] See Note 2 for a summary of adjustments

[4] See Note 2 for a summary of adjustments