Stock-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Share-Based Payment Arrangement, Restricted Stock Unit, Activity

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	15,027	466.15
Converted	(101,757)	233.39
Forfeited	(791)	461.95
Outstanding as of September 30, 2023	253,707	$	160.24

Schedule of Stock Based Compensation Expense

Stock-based compensation expense consists of the following:

(In millions)	For the Three Months Ended  September 30,				For the Nine Months Ended  September 30,
	2023		2022		2023		2022
Stock options	$	8.0	$	8.1	$	25.1	$	25.1
Restricted stock units	1.3		0.6		3.9		1.8
Total	$	9.3	$	8.7	$	29.0	$	26.9

Schedule of Future Share-Based Compensation Cost

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

(in millions)
Year	Total Projected Stock-Based Compensation Expense
Remainder of 2023	$	9.9
2024	38.2
2025	9.2
2026	3.6
2027	0.1
Total	$	61.0