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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Share-based compensation expense

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

			Year Ended December 31,
			2023						2022						2021
			(Dollars in millions)
Share-based compensation expense			$	6.9					$	8.4					$	10.0
Tax benefit			—						—						—
Share-based compensation expense, net of tax benefit			$	6.9					$	8.4					$	10.0
Cash received upon the exercise of stock options			—						—						—
Write-off tax benefits related to share-based compensation			—						—						—

Schedule of Share-based Compensation, Restricted Stock Units Activity

A summary of restricted stock unit activity is as follows:

			Year Ended December 31, 2023						Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2022			778,313						$	9.13
Granted			217,406						25.09
Vested			(550,352)						8.53
Forfeited			(14,953)						17.78
Nonvested at December 31, 2023			430,414						$	17.67

Schedule of Performance Units Activity

A summary of performance unit activity is as follows:

			Year Ended December 31, 2023						Weighted Average Remaining Contractual Life
Nonvested at December 31, 2022			450,021						—
Granted			531,915
Vested			(834,474)
Forfeited			(3,054)
Nonvested at December 31, 2023			144,408						2.0

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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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Tabular disclosure of the changes in outstanding nonvested performance-based units.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-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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