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Income Taxes - Reconciliation of Beginning and Ending Amount of Uncertain Tax Positions Excluding Interest and Penalties (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 2.9 $ 3.2 $ 3.2
Gross decreases - tax position in prior period 0.0 0.0 0.0
Gross increases - current-period tax positions 0.7 0.1 0.1
Settlements (0.1) 0.0 0.0
Lapse of statute of limitations 0.0 (0.3) (0.1)
Foreign exchange 0.0 (0.1) 0.0
Ending balance $ 3.5 $ 2.9 $ 3.2