Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020
Cash flows from operating activities:
Net income (loss)	$ 161.8	$ (110.7)
Noncash items:
Depreciation	19.9	19.6
Amortization	42.0	45.3
Allowance for credit losses	3.6	11.6
Stock-based compensation expense	14.3	11.7
Restructuring charges	0.3	9.0
Impairment charges	4.1	10.3
Amortization of right-of-use assets	14.3	15.2
Amortization of debt discount and issuance costs	12.0	2.7
Change in trade accounts receivable	(1.5)	126.1
Change in inventories	(47.9)	(9.4)
Change in trade accounts payable	(23.5)	(77.1)
Change in prepaid expenses and other assets	(7.2)	(3.0)
Change in accrued expenses and other liabilities	(34.2)	(90.8)
Change in operating lease liabilities	(20.7)	(18.1)
Net cash provided by (used in) operating activities	137.3	(57.6)
Cash flows from investing activities:
Acquisitions, net of cash acquired	0.0	(40.7)
Payments for additions to property, plant and equipment	(28.5)	(21.4)
All other investing activities	5.7	7.7
Net cash used in investing activities	(22.8)	(54.4)
Cash flows from financing activities:
Proceeds from issuance of convertible senior notes	0.0	517.5
Payment of debt issuance and other deferred financing costs	(2.3)	(17.3)
Proceeds from revolving line of credit	0.0	249.8
Repayment of borrowings	(475.6)	(0.1)
Purchase of capped calls related to issuance of convertible senior notes	0.0	(20.7)
Proceeds from stock option exercises	13.8	5.0
All other financing activities	1.0	(1.1)
Net cash (used in) provided by financing activities	(463.1)	733.1
Effect of exchange rate changes on cash and cash equivalents	13.6	(9.9)
Net change in cash and cash equivalents	(335.0)	611.2
Beginning balance of cash and cash equivalents	888.9	211.2
Ending balance of cash and cash equivalents	553.9	822.4
Supplemental data:
Cash paid for interest	22.1	16.8
Cash paid for taxes	51.1	14.2
ROU assets obtained in exchange for operating lease obligations	$ 10.8	$ 4.3