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Summary of Significant Accounting Policies - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jan. 03, 2026
Dec. 28, 2024
Assets    
Cash and cash equivalents $ 55.5 $ 51.0
Money market funds 96.8 72.6
Pension assets:    
Cash and cash equivalents (0.9) (1.3)
Equity securities 9.8 6.9
Debt securities 8.4 8.5
Real estate funds 4.7 3.6
Alternative investments 1.9 1.4
Other 0.9 0.1
Derivative instruments 1.0  
Equity securities   1.3
Total assets 178.1 151.6
Liabilities    
Pension benefit obligation 30.3 24.6
Total liabilities 31.7 24.7
Cash Flow Hedging    
Pension assets:    
Derivative instruments   6.8
Liabilities    
Derivative instruments - cash flow hedges 1.4 0.1
Warrant    
Pension assets:    
Derivative instruments   0.7
Level 1    
Assets    
Cash and cash equivalents 55.5 51.0
Money market funds 96.8 72.6
Pension assets:    
Cash and cash equivalents (0.9) (1.3)
Equity securities 9.8 6.9
Debt securities 8.4 8.5
Real estate funds 4.7 0.0
Alternative investments 0.0 0.0
Other 0.0 0.0
Derivative instruments 1.0  
Equity securities   1.3
Total assets 175.3 146.5
Liabilities    
Pension benefit obligation 30.3 24.6
Total liabilities 31.7 24.7
Level 1 | Cash Flow Hedging    
Pension assets:    
Derivative instruments   6.8
Liabilities    
Derivative instruments - cash flow hedges 1.4 0.1
Level 1 | Warrant    
Pension assets:    
Derivative instruments   0.7
Level 2    
Assets    
Cash and cash equivalents 0.0 0.0
Money market funds 0.0 0.0
Pension assets:    
Cash and cash equivalents 0.0 0.0
Equity securities 0.0 0.0
Debt securities 0.0 0.0
Real estate funds 0.0 3.6
Alternative investments 1.9 1.4
Other 0.9 0.1
Derivative instruments 0.0  
Equity securities   0.0
Total assets 2.8 5.1
Liabilities    
Pension benefit obligation 0.0 0.0
Total liabilities 0.0 0.0
Level 2 | Cash Flow Hedging    
Pension assets:    
Derivative instruments   0.0
Liabilities    
Derivative instruments - cash flow hedges 0.0 0.0
Level 2 | Warrant    
Pension assets:    
Derivative instruments   0.0
Level 3    
Assets    
Cash and cash equivalents 0.0 0.0
Money market funds 0.0 0.0
Pension assets:    
Cash and cash equivalents 0.0 0.0
Equity securities 0.0 0.0
Debt securities 0.0 0.0
Real estate funds 0.0 0.0
Alternative investments 0.0 0.0
Other 0.0 0.0
Derivative instruments 0.0  
Equity securities   0.0
Total assets 0.0 0.0
Liabilities    
Pension benefit obligation 0.0 0.0
Total liabilities 0.0 0.0
Level 3 | Cash Flow Hedging    
Pension assets:    
Derivative instruments   0.0
Liabilities    
Derivative instruments - cash flow hedges $ 0.0 0.0
Level 3 | Warrant    
Pension assets:    
Derivative instruments   $ 0.0