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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Share-based compensation expense

Share-based compensation expense and cash flow amounts were as follows:

			Year Ended December 31,
			2024						2023						2022
			(Dollars in millions)
Share-based compensation expense			$	7.3					$	6.9					$	8.4
Tax benefit			—						—						—
Share-based compensation expense, net of tax benefit			$	7.3					$	6.9					$	8.4

Schedule of Share-based Compensation, Restricted Stock Units Activity

A summary of restricted stock unit activity is as follows:

			Year Ended December 31, 2024						Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2023			430,414						$	17.67
Granted			541,982						18.56
Vested			(523,761)						12.86
Forfeited			(43,505)						24.62
Nonvested at December 31, 2024			405,130						$	24.32

Schedule of Performance Units Activity

A summary of performance unit activity is as follows:

			Year Ended December 31, 2024						Weighted Average Remaining Contractual Life
Nonvested at December 31, 2023			144,408						2.0
Granted			176,487
Vested			—
Forfeited			(45,984)
Nonvested at December 31, 2024			274,911						1.5

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- References

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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

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-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 changes in outstanding nonvested performance-based units.

+ 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)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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

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