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Debt (Schedule of Long term debt) (Details) - USD ($)
$ in Millions
Nov. 14, 2023
Dec. 27, 2024
Dec. 29, 2023
Jun. 16, 2022
Long-term Debt, Current Maturities [Abstract]        
Long-term Debt, Current Maturities   $ (3.9) $ (6.5)  
Long-term Debt, Excluding Current Maturities [Abstract]        
Long-term Debt, Gross   911.7 1,758.8  
Debt Issuance Costs, Noncurrent, Net   2.2 2.9  
Debt Issuance Costs, Net   2.2 2.9  
Debt, Long-term and Short-term, Combined Amount   915.6 1,765.3  
Debt Issuance Costs, Current, Net   0.0 0.0  
Debt instrument, face amount   865.6 1,647.8  
Debt Instrument, Face Amount, Current Maturity   3.9 6.5  
Debt Instrument, Face Amount, Noncurrent Maturity   861.7 1,641.3  
Ten Point Zero Percent First Lien Notes [Member]        
Long-term Debt, Excluding Current Maturities [Abstract]        
Debt instrument, face amount       $ 495.0
Ten Point Zero Percent Second Lien Notes (New 2L Notes)        
Long-term Debt, Excluding Current Maturities [Abstract]        
Extinguishment of Debt, Amount $ 321.9      
2017 Replacement Term Loan        
Long-term Debt, Excluding Current Maturities [Abstract]        
Debt instrument, face amount       1,392.9
2018 Replacement Term Loan        
Long-term Debt, Excluding Current Maturities [Abstract]        
Debt instrument, face amount       369.7
Eleven Point Five Percent First Lien Senior Secured Notes        
Long-term Debt, Excluding Current Maturities [Abstract]        
Extinguishment of Debt, Amount 650.0      
Ten Point Zero Percent Second Lien Notes due 2029        
Long-term Debt, Excluding Current Maturities [Abstract]        
Extinguishment of Debt, Amount 328.3      
Ten Point Zero Percent Second Lien Notes (Existing Notes)        
Long-term Debt, Excluding Current Maturities [Abstract]        
Debt instrument, face amount       322.9
First-Out Takeback Term Loan Due November 2028        
Long-term Debt, Current Maturities [Abstract]        
Long-term Debt, Current Maturities   0.0 (1.7)  
Long-term Debt, Excluding Current Maturities [Abstract]        
Long-term Debt, Gross   0.0 241.7  
Debt Issuance Costs, Noncurrent, Net   0.0 0.0  
Debt Issuance Costs, Current, Net   0.0 0.0  
Secured Debt   0.0 243.4  
Debt instrument, face amount 229.4      
Debt Instrument, Face Amount, Current Maturity   0.0 1.7  
Debt Instrument, Face Amount, Noncurrent Maturity   0.0 227.1  
Second-Out Takeback Term Loan Due November 2028        
Long-term Debt, Current Maturities [Abstract]        
Long-term Debt, Current Maturities   (3.9) (4.8)  
Long-term Debt, Excluding Current Maturities [Abstract]        
Long-term Debt, Gross   406.3 680.7  
Debt Issuance Costs, Noncurrent, Net   0.0 0.0  
Debt Issuance Costs, Current, Net   0.0 0.0  
Secured Debt   410.2 685.5  
Debt instrument, face amount 642.0      
Debt Instrument, Face Amount, Current Maturity   3.9 4.8  
Debt Instrument, Face Amount, Noncurrent Maturity   384.5 635.6  
Fourteen Point Seven Five Percent Second-Out Takeback Notes        
Long-term Debt, Excluding Current Maturities [Abstract]        
Debt instrument, face amount 778.6      
Receivables Financing Facility        
Long-term Debt, Excluding Current Maturities [Abstract]        
Long-term Debt, Gross   0.0 0.0  
Debt Issuance Costs, Noncurrent, Net   2.2 2.9  
Debt instrument, face amount       $ 200.0
Debt Instrument, Face Amount, Noncurrent Maturity   0.0 0.0  
Ten Point Zero Percent First Lien Notes Due April 2025        
Long-term Debt, Excluding Current Maturities [Abstract]        
Extinguishment of Debt, Amount 495.0      
Seven Point Five Percent        
Long-term Debt, Excluding Current Maturities [Abstract]        
Long-term Debt, Gross     836.4  
Debt Issuance Costs, Noncurrent, Net   0.0 0.0  
Secured Debt   505.4    
Debt instrument, face amount $ 778.6      
Debt Instrument, Face Amount, Noncurrent Maturity   $ 477.2 $ 778.6