Consolidated Statement of Changes in Shareholders' Equity Statement - USD ($) $ in Millions	Total	Ordinary Shares	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	$ 1.3				$ 1.3
Beginning balance, shares at Dec. 25, 2020		94,100,000				9,500,000
Beginning balance, value at Dec. 25, 2020	1,019.2	$ 18.8	$ 5,587.6	$ (2,961.5)	(9.6)	$ (1,616.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(717.4)			(717.4)
Vesting of restricted shares, shares		200,000				100,000
Vesting of restricted shares, value	(0.1)	$ (0.1)	0.0			$ 0.0
Share-based compensation	10.2		10.2
Ending balance, shares at Dec. 31, 2021		94,300,000				9,600,000
Ending balance, value at Dec. 31, 2021	313.4	$ 18.9	5,597.8	(3,678.9)	(8.3)	$ (1,616.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	(1.5)				(1.5)
Net loss	(313.1)			(313.1)
Share-based compensation	1.7		1.7
Cancellation of Predecessor equity	(0.5)	(18.9)	(5,599.5)	3,992.0	9.8	1,616.1
Cancellation of Predecessor equity, Shares		$ (94.3)				$ (9.6)
Ending balance, shares at Jun. 16, 2022		13,200,000				0
Ending balance, value at Jun. 16, 2022	2,203.6	$ 0.1	2,203.5	0.0	0.0	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues		13,200,000
Stock Issued During Period, Value, New Issues	2,189.7	$ 0.1	2,189.6
Adjustments to Additional Paid in Capital, Warrant Issued	13.9		13.9
Other Comprehensive Income (Loss), Net of Tax	10.8				10.8
Net loss	(598.1)			(598.1)
Share-based compensation	1.4		1.4
Ending balance, shares at Dec. 30, 2022		13,200,000				0
Ending balance, value at Dec. 30, 2022	1,613.7	$ 0.1	2,191.0	(588.2)	10.8	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payments for Repurchase of Warrants	(4.0)		13.9	(9.9)
Other Comprehensive Income (Loss), Net of Tax	(0.4)				(0.4)
Net loss	(1,631.3)			(1,631.3)
Vesting of restricted shares, shares		300,000				100,000
Vesting of restricted shares, value	0.1	$ 0.0	0.0			$ 0.1
Share-based compensation	8.9		8.9
Cancellation of Predecessor equity	9.2	(0.1)	(2,199.9)	2,219.5	(10.4)	0.1
Cancellation of Predecessor equity, Shares		$ (13.5)				$ (0.1)
Ending balance, shares at Nov. 14, 2023		19,700,000				0
Ending balance, value at Nov. 14, 2023	1,194.8	$ 0.2	1,194.6	0.0	0.0	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues		19,700,000
Stock Issued During Period, Value, New Issues	1,169.7	$ 0.2	1,169.5
Adjustments to Additional Paid in Capital, Contingent Value Rights Issued			25.1
Adjustments to Additional Paid in Capital, Warrant Issued	25.1
Beginning balance, shares at Dec. 30, 2022		13,200,000				0
Beginning balance, value at Dec. 30, 2022	1,613.7	$ 0.1	2,191.0	(588.2)	10.8	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted shares, value						$ 0.0
Ending balance, shares at Dec. 29, 2023		19,700,000				0
Ending balance, value at Dec. 29, 2023	1,160.2	$ 0.2	1,194.6	(38.2)	3.6	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	3.6
Beginning balance, shares at Nov. 14, 2023		19,700,000				0
Beginning balance, value at Nov. 14, 2023	1,194.8	$ 0.2	1,194.6	0.0	0.0	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(38.2)			(38.2)
Ending balance, shares at Dec. 29, 2023		19,700,000				0
Ending balance, value at Dec. 29, 2023	$ 1,160.2	$ 0.2	$ 1,194.6	$ (38.2)	$ 3.6	$ 0.0