Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 01, 2018	Dec. 31, 2017	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017	Dec. 31, 2017
Income Taxes [Abstract]
U.S. corporate income tax rate				21.00%		35.00%
Provisional income tax benefit		$ (47.3)
Amount of unrecognized tax benefits	$ 15.4			$ 15.4
Unrecognized tax benefits that would impact effective tax rate	11.1			11.1
Unrecognized tax benefits, net increase in penalties and interest expenses	0.2			0.5
Unrecognized tax benefits, accrued interest and penalties	2.0			2.0
Provision for taxes on income	$ 10.3		$ 13.4	$ 19.6	$ 23.5
Effective income tax rate				18.90%	22.90%