Fair Value - Summary of the Level 3 Activity - (Details) $ in Millions	12 Months Ended
	Dec. 25, 2020 USD ($)
Pension Obligation [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	$ 4.4
Ending balance	4.7
Pension Obligation [Member] | SSB [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Benefits and other adjustments	0.3
Common Stock Purchase Obligation [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	6.8
Ending balance	12.6
Common Stock Purchase Obligation [Member] | Quantum Global Technologies, LLC [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value adjustments	5.8
Contingent Earn-out Liability [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	9.5
Contingent Earn-out Liability [Member] | Dynamic Manufacturing Solutions [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value adjustments	3.0
Contingent Earn-out Liability [Member] | SSB [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Benefits and other adjustments	$ (12.5)