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Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Stock-Based Compensation Expenses

The following table shows stock-based compensation unamortized compensation expense and the weighted-average periods over which the unamortized compensation expense is expected to be recognized:

			Year ended December 31,
(in millions, except years)			2024						2023						2022
Unamortized compensation expense			$	13.5					$	13.3					$	14.9
Expected period to be recognized for employees			3.7 years						4.1 years						4.3 years
Expected period to be recognized for directors			0.3 years						0.3 years						0.3 years

Schedule of Share-Based Payment Arrangement, Restricted Stock and Performance-Based Share Activity

Our restricted and performance-based share activity was as follows for the years ended December 31, 2024 and 2023:

			Shares						Weighted Average Grant Date Fair Value per Share
Balance at December 31, 2022			880,829						$	31.79
Granted			230,875						27.00
Vested			(248,065)						36.30
Performance Shares Target Adjustment			29,137						36.30
Forfeited			(11,800)						35.36
Balance at December 31, 2023			880,976						$	29.48
Granted			277,742						24.25
Vested			(181,430)						34.46
Performance Shares Target Adjustment			(14,247)						39.28
Forfeited			(34,017)						29.83
Balance at December 31, 2024			929,024						$	26.82

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- References

No definition available.

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- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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