Debt (Narrative) (Details) - USD ($) $ in Millions	Sep. 29, 2023	Dec. 30, 2022	Jun. 16, 2022
Debt Instrument
Debt Instrument, Face Amount		$ 3,534.1
10.00% First Lien Senior Notes
Debt Instrument
Debt Instrument, Face Amount		495.0	$ 495.0
10.00% Second Lien Senior Notes
Debt Instrument
Debt Instrument, Face Amount		321.9
2017 Replacement Term Loan
Debt Instrument
Debt Instrument, Face Amount	$ 1,356.7	1,374.1
2018 Replacement Term Loan
Debt Instrument
Debt Instrument, Face Amount	$ 360.1	364.8
Ten Point Zero Percent Second Lien Notes due 2029
Debt Instrument
Debt Instrument, Face Amount		328.3
Eleven Point Five Percent First Lien Senior Secured Notes
Debt Instrument
Debt Instrument, Face Amount		$ 650.0