Income Taxes Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2018 USD ($)	Sep. 29, 2017	Sep. 28, 2018 USD ($)	Sep. 29, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	17.20%	23.10%	17.00%	25.20%
U.S. federal statutory rate			21.00%	35.00%
TCJA adjustments - increase (decrease) in tax expense	$ 1.2		$ (4.9)
Tax cuts and jobs act of 2017, incomplete accounting, adjustment, increase (decrease) in effective tax rate	0.0040		(0.0050)
Tax cuts and jobs act of 2017, incomplete accounting, revaluation of deferred tax assets and liabilities - increase (decrease) in tax expense	$ 3.2		$ (11.9)
Tax cuts and jobs act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional liability - increase (decrease) in tax expense	$ (2.0)		(3.9)
Tax cuts and jobs act of 2017, incomplete accounting, foreign tax credit, provisional liability - increase (decrease) in tax expense			$ 10.9