Unaudited Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Income Statement [Abstract]
Loss (income) on disposal of discontinued operations, tax	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Amount of tax expense (benefit) on gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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