Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Income Tax Disclosure [Abstract]
Provisional income tax expense			$ 4.7
Adjustment to provisional income tax expense	$ (0.6)	$ 0.6
Effective income tax rate	9.90%			15.60%	15.40%	19.70%
Discrete items	$ 11.4			$ 9.9	$ 16.9	$ 15.9
Discrete tax benefit due to remeasurement of uncertain tax positions				7.4		7.7
Discrete tax benefit due to release of valuation allowance				0.4		8.5
Discrete tax expense (benefit), share-based accounting	$ 5.0			$ 2.3	$ 12.7	5.1
Tax settlement for uncertain tax positions discrete items amount						$ 4.6
Effective income tax rate, excluding discrete items	21.30%			27.70%	21.30%	27.70%