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Pensions (Tables)
9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Pension Expense (Income)
The following table presents the components of the Company’s net pension expense:
(dollars in millions)Three Months Ended
September 30,
Nine Months Ended
September 30,
2024202320242023
Service cost$0.3 $0.2 $0.8 $0.7 
Interest cost0.3 0.3 1.0 0.9 
Expected return on plan assets(0.3)(0.3)(0.9)(0.9)
Amortization of unrecognized loss0.1 — 0.2 0.1 
Amortization of prior service cost— — 0.1 0.1 
Defined benefit plan expense before settlement income0.4 0.2 1.2 0.9 
Settlement income— — — (6.0)
Total pension expense (income)$0.4 $0.2 $1.2 $(5.1)