Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2024	Sep. 28, 2023	Sep. 26, 2024	Sep. 28, 2023
Income Statement [Abstract]
Revenues	$ 1,470.6	$ 1,438.9	$ 4,665.3	$ 4,235.0
Operating costs and expenses
Cost of sales	1,716.6	1,492.5	5,580.3	4,320.2
Selling, general and administrative	93.8	69.2	258.9	217.2
Unusual or Infrequent Item, or Both, Net (Gain) Loss		0.8		8.1
Restructuring Charges	(0.1)	0.0	0.7	7.2
Research and development	10.4	10.1	34.4	33.9
Other Expenses	0.0	0.8	0.0	5.7
Total operating costs and expenses	1,820.7	1,572.6	5,874.3	4,584.2
Operating loss	(350.1)	(133.7)	(1,209.0)	(349.2)
Interest expense and financing fee amortization	(90.8)	(75.1)	(253.3)	(221.1)
Other (expense) income, net	33.0	(7.3)	30.3	120.0
Loss before income taxes and equity in net income (loss) of affiliates	(473.9)	(201.5)	(1,492.6)	(690.3)
Income tax provision	(2.8)	(2.4)	(15.9)	(1.1)
Loss before equity in net income (loss) of affiliates	(476.7)	(203.9)	(1,508.5)	(691.4)
Equity in net income (loss) of affiliates	0.1	0.0	0.2	(0.2)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(476.6)	(203.9)	(1,508.3)	(691.6)
Net loss	(476.9)	(204.1)	(1,508.9)	(691.6)
Net Income (Loss) Attributable to Noncontrolling Interest	$ (0.3)	$ (0.2)	$ (0.6)	$ 0.0
Loss per share
Earnings Per Share, Basic	$ (4.07)	$ (1.94)	$ (12.93)	$ (6.58)
Diluted (in dollars per share)	$ (4.07)	$ (1.94)	$ (12.93)	$ (6.58)