A summary of restricted stock unit activity is presented in the following table:


Restricted Stock Units	Number of Restricted Stock Units	Weighted Average Grant-Date Fair Value Per Share
Outstanding as of December 31, 2022	341,228	$	169.28
Granted	13,356	463.08
Converted	(101,757)	233.39
Forfeited	(516)	469.72
Outstanding as of June 30, 2023	252,311	$	158.36

Stock-based compensation expense consists of the following:


(In millions)	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2023		2022		2023		2022
Stock options	$	8.6	$	8.5	$	17.1	$	17.0
Restricted stock units	1.2		0.6		2.6		1.2

Total	$	9.8	$	9.1	$	19.7	$	18.2

We expect to recognize the future stock-based compensation expense as follows:


(in millions)
Year	Total Projected Stock-Based Compensation Expense
Remainder of 2023	$	19.9
2024	38.8
2025	9.0
2026	3.4
2027	0.1
Total	$	71.2