Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured (Details) - USD ($) $ in Millions	Jun. 26, 2020	Dec. 27, 2019
Contingent Earn-out Liability [Member]
Other liabilities:
Liabilities measured at fair value	$ 12.5	$ 9.5
Common Stock Purchase Obligation [Member]
Other liabilities:
Liabilities measured at fair value	8.0	6.8
Pension Obligation [Member]
Other liabilities:
Liabilities measured at fair value	3.7	4.4
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Contingent Earn-out Liability [Member]
Other liabilities:
Liabilities measured at fair value	12.5
Significant Unobservable Inputs (Level 3) [Member] | Contingent Earn-out Liability [Member]
Other liabilities:
Liabilities measured at fair value		9.5
Significant Unobservable Inputs (Level 3) [Member] | Common Stock Purchase Obligation [Member]
Other liabilities:
Liabilities measured at fair value	8.0	6.8
Significant Unobservable Inputs (Level 3) [Member] | Pension Obligation [Member]
Other liabilities:
Liabilities measured at fair value	$ 3.7	$ 4.4