Financial Information of Registrant (Parent Company Only) - Schedule of Statements of Balance Sheets (Details) - USD ($) $ in Millions	Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Current assets:
Cash and cash equivalents	$ 309.7	$ 132.8	$ 72.0
Total assets	3,363.8	3,401.5
Liabilities and Shareholders' Equity (Deficit)
Accrued expenses	299.6	284.7
Total liabilities	2,953.3	4,412.3
Preferred Redeemable shares, $1.39 nominal value per share, 50,000 and no shares issued and outstanding as of January 2, 2022 and January 3, 2021, respectively	0.1	0.0
Ordinary shares, $0.00001 par value, 1,000,000,000 shares authorized, 237,203,879 and 147,295,511 shares issued and outstanding as of January 2, 2022 and January 3, 2021, respectively	0.0	0.0
Additional paid-in capital	2,425.9	975.1
Accumulated deficit	(1,971.8)	(1,917.5)
Accumulated other comprehensive loss	(43.7)	(68.4)
Total shareholders' equity (deficit)	410.5	(1,010.8)	$ (812.8)	$ (654.7)
Total liabilities and shareholders' equity (deficit)	3,363.8	3,401.5
Parent Company
Current assets:
Cash and cash equivalents	17.0	1.8
Receivables from subsidiaries	0.0	0.2
Investments in subsidiaries	400.9	0.0
Loans receivable from subsidiaries	0.0	3.2
Total assets	417.9	5.2
Liabilities and Shareholders' Equity (Deficit)
Payables to subsidiaries	6.9	0.8
Accrued expenses	0.5	0.0
Investments in subsidiaries	0.0	1,015.2
Total liabilities	7.4	1,016.0
Preferred Redeemable shares, $1.39 nominal value per share, 50,000 and no shares issued and outstanding as of January 2, 2022 and January 3, 2021, respectively	0.1	0.0
Ordinary shares, $0.00001 par value, 1,000,000,000 shares authorized, 237,203,879 and 147,295,511 shares issued and outstanding as of January 2, 2022 and January 3, 2021, respectively	0.0	0.0
Additional paid-in capital	2,425.9	975.1
Accumulated deficit	(1,971.8)	(1,917.5)
Accumulated other comprehensive loss	(43.7)	(68.4)
Total shareholders' equity (deficit)	410.5	(1,010.8)
Total liabilities and shareholders' equity (deficit)	$ 417.9	$ 5.2