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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The components of net periodic benefit cost and other amounts recognized in OCI were as follows:
Pension benefitsOther retirement benefits
($ in millions)202420232022202420232022
Net periodic benefit cost:
Service cost$1.2 $1.1 $1.5 $— $— $— 
Interest cost2.1 2.4 4.2 0.2 0.2 0.2 
Expected return on plan assets(1.3)(1.2)(6.1)— — — 
Amortization of actuarial loss (gain)0.6 0.6 1.3 (1.6)(2.0)(1.9)
Settlement loss— 0.1 52.2 — — — 
Other1.0 0.3 1.0 — 0.4 0.4 
Net periodic benefit cost$3.6 $3.3 $54.1 $(1.4)$(1.4)$(1.3)
Other changes in plan assets and benefit obligations recognized in OCI, pre-tax:
Net (gain) loss arising during period$(0.7)$(1.4)$16.0 $(0.5)$(0.5)$(2.0)
Amortization of actuarial (loss) gain(0.6)(0.3)(1.3)1.6 2.0 1.9 
Settlement loss— (0.1)(52.2)— — — 
Foreign currency translation(0.2)0.7 (2.3)— — — 
Other— 0.4 — — — (0.4)
Total recognized in OCI$(1.5)$(0.7)$(39.8)$1.1 $1.5 $(0.5)
Total recognized in net periodic benefit cost and OCI$2.1 $2.6 $14.3 $(0.3)$0.1 $(1.8)

Net periodic benefit cost by geographic location is as follows:
 Pension benefitsOther retirement benefits
($ in millions)202420232022202420232022
U.S. plans$1.1 $0.8 $51.7 $(1.4)$(1.4)$(1.3)
International plans2.5 2.5 2.4 — — — 
Net periodic benefit cost$3.6 $3.3 $54.1 $(1.4)$(1.4)$(1.3)
Schedule of Changes in Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status
The following table presents the changes in the benefit obligation and the fair value of plan assets, as well as the funded status of the plans:
Pension benefitsOther retirement benefits
($ in millions)2024202320242023
Change in benefit obligation:
Benefit obligation, January 1$(57.5)$(55.5)$(3.7)$(3.9)
Service cost(1.2)(1.1)— — 
Interest cost(2.1)(2.4)(0.2)(0.2)
Participants’ contributions(0.1)(0.2)(0.2)(0.4)
Actuarial gain2.2 0.7 0.6 0.5 
Benefits paid3.4 2.5 0.3 0.3 
Settlement loss— 0.5 — — 
Foreign currency translation2.1 (2.0)— — 
Benefit obligation, December 31$(53.2)$(57.5)$(3.2)$(3.7)
Change in plan assets:
Fair value of assets, January 1$32.3 $29.4 $— $— 
Actual return on plan assets(0.6)2.4 — — 
Employer contribution0.7 1.1 0.1 (0.1)
Participants’ contributions0.1 0.2 0.2 0.4 
Benefits paid(2.5)(1.8)(0.3)(0.3)
Settlement loss— (0.5)— — 
Foreign currency translation(0.8)1.5 — — 
Fair value of assets, December 31$29.2 $32.3 $— $— 
Funded status at end of year$(24.0)$(25.2)$(3.2)$(3.7)
Schedule of Amounts Recognized in Balance Sheet
Amounts recognized in the balance sheet were as follows:
Pension benefitsOther retirement benefits
($ in millions)2024202320242023
Noncurrent assets$2.9 $2.7 $— $— 
Current liabilities(1.4)(1.4)(0.5)(0.6)
Noncurrent liabilities(25.5)(26.5)(2.7)(3.1)
$(24.0)$(25.2)$(3.2)$(3.7)
Schedule of Amounts Recognized in Other Comprehensive Loss
The amounts in accumulated other comprehensive loss, pre-tax, consisted of:
Pension benefitsOther retirement benefits
($ in millions)2024202320242023
Net actuarial loss (gain)$14.4 $15.8 $(2.6)$(3.6)
Prior service credit(1.2)(1.1)— — 
Total$13.2 $14.7 $(2.6)$(3.6)
Schedule of Expected Benefit Payments
Benefit payments expected to be paid under our defined benefit pension and other retirement benefit plans in the next ten years are as follows. The expected benefit payments listed correspond to regular ongoing benefit payments expected to be made by the plans during future years.
 ($ in millions)Domestic International Total
2025$1.3 $2.5 $3.8 
20261.1 3.1 4.2 
20271.0 3.6 4.6 
20281.0 3.2 4.2 
20290.9 4.0 4.9 
2030 to 20343.6 17.2 20.8 
$8.9 $33.6 $42.5 
Schedule of Assumptions Used
Weighted average assumptions used to determine net periodic benefit cost were as follows:
Pension benefitsOther retirement benefits
202420232022202420232022
Discount rate3.95 %4.35 %2.48 %5.20 %5.55 %2.75 %
Rate of compensation increase3.08 %3.09 %2.79 %— — — 
Expected long-term rate of return on assets4.01 %4.22 %4.14 %— — — 

Weighted average assumptions used to determine the benefit obligations were as follows:
Pension benefitsOther retirement benefits
2024202320242023
Discount rate4.38 %3.95 %5.60 %5.20 %
Rate of compensation increase3.07 %3.08 %— — 
The weighted average interest crediting rating used to determine net periodic benefit cost by geographic location for our pension plans, at December 31, were as follows:
202420232022
U.S. plans4.00 %4.00 %3.31 %
International plans1.13 %1.13 %1.75 %
Schedule of Allocation of Plan Assets
The weighted average asset allocations by asset category for our pension plans, at December 31, were as follows:
20242023
Equity securities21 %16 %
Debt securities75 %80 %
Other4 %4 %
100 %100 %
The following are the target asset allocations and acceptable allocation ranges across:
Target allocationAllocation range
Equity securities
19%
15% - 20%
Debt securities
79%
75% - 85%
Other
2%
2% - 5%
The following tables present the fair value of our pension plan assets, utilizing the fair value hierarchy discussed in Note 12, Fair Value Measurements. In accordance with U.S. GAAP, certain pension plan assets measured at net asset value (“NAV”) have not been classified in the fair value hierarchy.
Balance at
December 31,Basis of Fair Value Measurements
($ in millions)2024Level 1Level 2Level 3
Cash$0.6 $0.6 $— $— 
Equity securities:
International mutual funds6.2 — 6.2 — 
Fixed income securities:
International mutual funds21.8 — 21.8 — 
Other mutual funds0.6 — 0.6 — 
Pension plan assets in the fair value hierarchy$29.2 $0.6 $28.6 $— 
Pension plan assets measured at NAV— 
Pension plan assets at fair value$29.2 
Balance at
December 31,Basis of Fair Value Measurements
($ in millions)2023Level 1Level 2Level 3
Cash$0.6 $0.6 $— $— 
Equity securities:
International mutual funds5.3 — 5.3 — 
Fixed income securities:
International mutual funds25.9 — 25.9 — 
Other mutual funds0.5 — 0.5 — 
Pension plan assets in the fair value hierarchy$32.3 $0.6 $31.7 $— 
Pension plan assets measured at NAV— 
Pension plan assets at fair value$32.3