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Stock-Based Compensation Expense

6 Months Ended

Jun. 30, 2021

Compensation expense related to stock-based awards was recorded as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2021		2020		2021		2020
Cost of revenue	$	0.1	$	0.1	$	0.2	$	0.2
Research and development expenses	2.0		2.3		3.9		5.0
Selling, general and administrative expenses	6.9		3.4		13.5		8.5
Total	$	9.0	$	5.8	$	17.6	$	13.7