Certain of the amounts in the above tables may not total due to rounding of individual amounts.

Total share-based compensation expense related to the Company’s stock options, restricted stock units, stock grant awards, and employee stock purchase plan is included below.

		Quarter Ended												Year Ended
		December 31, 2018				September 28, 2018				December 31, 2017				December 31, 2018				December 31, 2017
Cost of revenue		$	1.9			$	1.7			$	1.6			$	7.0			$	6.0
Research and development		3.7				3.4				2.9				14.3				12.5
Selling and marketing		3.6				3.3				2.9				14.1				11.7
General and administrative		9.7				9.5				9.7				42.9				39.6
Total share-based compensation expense		$	18.9			$	17.9			$	17.1			$	78.3			$	69.8

NON-GAAP MEASURES