Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019
Statement of Cash Flows [Abstract]
Net income	$ 209.9	$ 235.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	29.4	29.7
Amortization expense	120.2	128.6
Provision for doubtful accounts	7.8	5.4
Deferred income taxes	12.1	4.4
Non-cash restructuring expense	8.7	2.6
Stock-based compensation	57.1	52.1
Income from equity method investments, net of dividends	(22.4)	(9.5)
Provision for excess and obsolete inventories	13.3	4.8
Other, net	21.3	(8.5)
(Increase) decrease in assets:
Accounts receivable, net	108.4	16.8
Inventories	(19.1)	1.7
Other current and non-current assets	12.3	10.4
Increase (decrease) in liabilities:
Accounts payable	(26.7)	13.6
Accrued compensation and benefits	26.1	(52.3)
Deferred revenue	(42.0)	33.4
Other current and non-current liabilities	(32.7)	(5.5)
Net cash provided by operating activities	483.7	462.8
Cash flow from investing activities:
Acquisitions of businesses, net of cash acquired	(198.9)	(28.6)
Acquisitions of property and equipment	(45.1)	(54.6)
Other, net	(0.1)	14.5
Net cash used in investing activities	(244.1)	(68.7)
Cash flow from financing activities:
Issuance of common stock, net of tax withholdings	25.3	28.4
Repurchases of common stock	(78.0)	(179.8)
Proceeds from debt and revolving credit lines	1,030.1	818.0
Payments on debt and revolving credit lines	(1,209.6)	(1,033.6)
Other, net	(10.9)	(10.2)
Net cash used in financing activities	(243.1)	(377.2)
Effect of exchange rate changes on cash and cash equivalents	(1.7)	(4.8)
Net increase (decrease) in cash and cash equivalents	(5.2)	12.1
Cash and cash equivalents - beginning of period	189.2	172.5
Cash and cash equivalents - end of period	$ 184.0	$ 184.6