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Pension Benefits and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The components of net periodic benefit cost (credit) were as follows:
Pension Benefits
Three Months EndedNine Months Ended
September 30,September 30,
(Dollars in millions)2024202320242023
Interest cost$0.2 $0.3 $0.7 $0.8 
Expected return of plan assets(0.4)(0.4)(1.0)(1.1)
Amortization of net loss (gain)0.2 0.1 0.4 0.4 
Net periodic benefit cost (credit)$ $— $0.1 $0.1