Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (4.1)	$ 24.7	$ 0.1	$ 28.2
Effective tax rate	(22.90%)	23.40%	0.20%	21.80%
Tax benefit from release of valuation allowance	$ 5.1
Tax expense on gain on investment in TS Kelly Asia Pacific equity affiliate		$ 23.5