Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 26, 2025	Mar. 28, 2025	Sep. 27, 2024	Mar. 29, 2024	Sep. 26, 2025	Sep. 27, 2024	Dec. 31, 2024
Cash flows from operating activities:
Net (loss) income	$ (30.3)	$ 18.0	$ 8.2	$ 23.6	$ 14.1	$ (1,119.8)
Noncash items:
Depreciation					30.0	31.6
Amortization					56.9	63.7
Allowance for credit losses					6.0	16.0
Stock-based compensation expense					27.2	26.1
Gain on investments in rabbi trust, net					(3.0)	(0.6)
Loss on equity investments, net					0.0	1.1
Loss on sale of property, plant and equipment					0.3	0.0
Goodwill and intangible asset impairments	0.0		0.0		0.0	1,153.8
Fixed assets impairments and other charges					2.2	17.1
Non-cash operating lease costs					25.8	23.1
Amortization of debt discount and issuance costs					3.2	3.7
Deferred income taxes					25.4	(46.8)
Change in trade accounts receivable					(23.6)	(0.9)
Change in inventories					(34.6)	(11.6)
Change in trade accounts payable					(25.9)	(7.5)
Change in prepaid expenses and other assets					1.5	(12.9)
Change in accrued expenses and other liabilities					95.0	99.5
Change in operating lease liabilities					(32.8)	(31.5)
Net cash provided by operating activities					167.7	204.1
Cash flows from investing activities:
Payments for additions to property, plant and equipment					(29.0)	(25.2)
Purchases of investments held in rabbi trust					(9.6)	(32.6)
Proceeds from sale of investments held in rabbi trust					9.9	8.8
Proceeds from sales of property, plant and equipment					0.5	0.0
Proceeds from sale of equity investment					0.0	0.4
All other investing activities, net					(7.4)	1.4
Net cash used in investing activities					(35.6)	(47.2)
Cash flows from financing activities:
Proceeds from stock option exercises					2.5	2.0
Cash paid for treasury stock					(142.3)	0.0
Tax withholding payment related to net settlement of equity awards					(5.0)	(4.0)
Repayment of convertible notes due 2025					(116.3)	0.0
Repayment of borrowings					0.0	(100.0)
Proceeds from revolving line of credit					115.4	0.0
All other financing activities					0.0	(0.8)
Net cash used in financing activities					(145.7)	(102.8)
Effect of exchange rate changes on cash and cash equivalents					78.4	(2.8)
Net change in cash and cash equivalents					64.8	51.3
Beginning balance of cash and cash equivalents		$ 1,069.1		$ 940.0	1,069.1	940.0	$ 940.0
Ending balance of cash and cash equivalents	$ 1,133.9		$ 991.3		1,133.9	991.3	$ 1,069.1
Supplemental data:
Cash paid for interest					27.1	45.4
Cash paid for taxes					42.5	29.8
ROU assets obtained in exchange for operating lease obligations					$ 24.6	$ 44.5