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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share:
(Dollars and shares in millions, except per share amounts)Three Months EndedSix Months Ended
June 30, 2024June 30, 2023June 30, 2024June 30, 2023
Numerator:   
Net income$8.1 $17.9 $15.9 $14.4 
Denominator:
Weighted-average shares outstanding - basic18.6 18.6 18.6 18.6 
Effect of dilutive shares— 0.1 — 0.1 
Weighted-average shares outstanding - diluted18.6 18.7 18.6 18.7 
Basic earnings per share$0.44 $0.96 $0.85 $0.77 
Diluted earnings per share$0.44 $0.96 $0.85 $0.77