Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Compensation Amounts Included in Net Income

The table below presents the amounts included in net income related to share-based compensation expense for the awards granted under the SICP for the years ended December 31, 2024, 2023 and 2022:

	For the Year Ended December 31,
	2024		2023		2022
(in millions)
Awards to key employees	$	7.5	$	6.7	$	5.5
Awards to non-employee directors	0.9		0.9		1.0
Total compensation expense	8.4		7.6		6.5
Less: tax benefit	(2.2)		(1.9)		(1.7)
Share-based compensation expense included in net income	$	6.2	$	5.7	$	4.8

Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block]

The below table presents the number of shares withheld and amounts remitted:

	For the Year Ended December 31,
	2024		2023		2022
(dollars in millions, shares in thousands)
Shares withheld to satisfy tax obligations	14		20		22
Amounts remitted to tax authorities to satisfy obligations	$	1.5	$	2.5	$	2.8

SICP Awards to Key Employees

Summary of Stock Activity Non-employee directors

The table below presents the summary of the stock activity for awards to all officers and key employees:

(in thousands, except per share data)	Number of Shares	Weighted Average Fair Value
Outstanding — December 31, 2022	204	$	103.17
Granted	81	126.06
Vested	(68)	91.59
Expired	(2)	94.64
Forfeited	(2)	113.44
Outstanding — December 31, 2023	213	117.74
Granted	110	105.21
Vested	(43)	103.95
Expired	(27)	86.24
Forfeited	—	—
Outstanding — December 31, 2024	253	$	117.96