Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015
Cash flows from operating activities:
Net income	$ 55.3	$ 59.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	18.8	17.9
Amortization expense	79.9	81.5
Provision for doubtful accounts	2.4	1.2
Deferred income taxes	0.5	(0.8)
Stock-based compensation	26.7	24.5
Income from equity method investments	(8.7)	(9.4)
Divestitures gain, net	(2.7)	(5.6)
Excess tax benefit for stock-based compensation	(3.1)	(0.9)
Provision for excess and obsolete inventories	8.8	2.0
Other non-cash items	3.0	10.0
Decrease (increase) in assets:
Accounts receivable	(18.2)	1.3
Other receivables	(1.5)	3.7
Inventories	11.2	(11.8)
Other current and non-current assets	(7.8)	(8.3)
Increase (decrease) in liabilities:
Accounts payable	6.4	6.1
Accrued compensation and benefits	2.2	(0.8)
Deferred revenue	53.8	49.5
Accrued warranty	(0.7)	(1.4)
Other liabilities	(33.8)	(14.5)
Net cash provided by operating activities	192.5	204.0
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(20.0)	(59.1)
Acquisitions of property and equipment	(12.2)	(26.5)
Purchases of equity method investments	(1.5)	(2.8)
Net proceeds from sale of businesses	10.7	12.6
Dividends received from equity method investments	10.7	7.7
Other	(0.3)	0.4
Net cash used in investing activities	(12.6)	(67.7)
Cash flows from financing activities:
Issuances of common stock, net of tax withholdings	25.0	16.0
Repurchase and retirement of common stock	(88.3)	(73.0)
Excess tax benefit for stock-based compensation	3.1	0.9
Proceeds from debt and revolving credit lines	202.0	220.0
Payments on debt and revolving credit lines	(207.0)	(312.1)
Net cash used in financing activities	(65.2)	(148.2)
Effect of exchange rate changes on cash and cash equivalents	1.2	(7.1)
Net increase (decrease) in cash and cash equivalents	115.9	(19.0)
Cash and cash equivalents, beginning of period	116.0	148.0
Cash and cash equivalents, end of period	$ 231.9	$ 129.0