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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Income Taxes [Line Items]
Income tax expense (benefit)	$ 12.7	$ (15.6)	$ 19.1	$ (9.2)
Effective income tax rate, percent	13.20%	49.60%	15.30%	(366.20%)
United Kingdom
Income Taxes [Line Items]
Increase (decrease) in valuation allowance	$ (14.3)
Germany
Income Taxes [Line Items]
Increase (decrease) in valuation allowance	3.9
Persol Holdings
Income Taxes [Line Items]
Income tax expense (benefit)	$ 18.7	$ (16.2)	$ 22.8	$ (8.9)

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[Line Items] for Income Taxes [Table]

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

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