Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2025	Jun. 27, 2024	Jul. 03, 2025	Jun. 27, 2024
Income Statement [Abstract]
Revenues	$ 1,635.1	$ 1,491.9	$ 3,156.9	$ 3,194.7
Operating costs and expenses
Cost of sales	1,866.5	1,725.4	3,849.4	3,863.7
Selling, general and administrative	107.3	83.6	199.1	165.1
Restructuring Charges	0.0	0.8	0.0	0.8
Research and development	12.2	13.4	26.7	24.0
Gain (Loss) on Disposition of Business	129.9	0.0	49.5	0.0
Total operating costs and expenses	2,115.9	1,823.2	4,124.7	4,053.6
Operating loss	(480.8)	(331.3)	(967.8)	(858.9)
Interest expense and financing fee amortization	(99.4)	(82.3)	(198.9)	(162.5)
Other (expense) income, net	24.3	(0.4)	44.2	(2.7)
Loss before income taxes and equity in net income (loss) of affiliates	(604.5)	(413.2)	(1,210.9)	(1,018.7)
Income tax provision	(26.3)	(2.1)	(32.3)	(13.1)
Loss before equity in net income (loss) of affiliates	(630.8)	(415.3)	(1,243.2)	(1,031.8)
Equity in net income (loss) of affiliates	0.0	0.2	(0.3)	0.1
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(630.8)	(415.1)	(1,243.5)	(1,031.7)
Net loss	(631.0)	(415.3)	(1,243.9)	(1,032.0)
Net Income (Loss) Attributable to Noncontrolling Interest	$ (0.2)	$ (0.2)	$ (0.4)	$ (0.3)
Loss per share
Earnings Per Share, Basic	$ (5.36)	$ (3.56)	$ (10.57)	$ (8.87)
Diluted (in dollars per share)	$ (5.36)	$ (3.56)	$ (10.57)	$ (8.87)