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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Income Taxes [Line Items]
Income tax expense (benefit)	$ (1.2)	$ (12.8)	$ (36.5)	$ 6.3
Outside basis difference			(7.7)
Increase (decrease) in valuation allowance				(10.4)
Persol Holdings
Income Taxes [Line Items]
Income tax expense (benefit)	$ 5.2	$ (12.1)	(9.6)	$ 10.7
Goodwill
Income Taxes [Line Items]
Income tax expense (benefit)			$ (23.0)

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[Line Items] for Income Taxes [Table]

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Income Taxes, Outside Basis Difference

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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