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Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2021
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)202120202019202120202019
Net periodic benefit cost:
Service cost$1.6 $1.5 $1.4 $— $— $— 
Interest cost6.2 7.1 9.2 0.2 0.2 0.2 
Expected return on plan assets(11.9)(11.7)(12.0)— — — 
Amortization of prior service credit0.1 0.1 0.1 (0.4)(0.7)(0.7)
Amortization of actuarial loss (gain)1.8 2.0 2.1 (1.6)(1.9)(2.3)
Settlement loss1.8 3.7 3.5 — — — 
Net periodic benefit cost$(0.4)$2.7 $4.3 $(1.8)$(2.4)$(2.8)
Other changes in plan assets and benefit obligations recognized in OCI, pre-tax:
Net (gain) loss arising during period$(6.3)$1.8 $1.5 $(0.9)$(0.4)$0.1 
Prior service credit arising during period(2.0)— — — — — 
Amortization of prior service credit(0.1)(0.1)(0.1)0.4 0.7 0.7 
Amortization of actuarial (loss) gain(1.8)(2.0)(2.1)1.6 1.9 2.3 
Settlement loss(1.8)(3.7)(3.5)— — — 
Foreign currency translation (0.9)1.8 0.6 — — — 
Total recognized in OCI$(12.9)$(2.2)$(3.6)$1.1 $2.2 $3.1 
Total recognized in net periodic benefit cost and OCI$(13.3)$0.5 $0.7 $(0.7)$(0.2)$0.3 

Net periodic benefit cost by geographic location is as follows:
 Pension benefitsOther retirement benefits
($ in millions)202120202019202120202019
U.S. plans$(2.3)$1.2 $2.4 $(1.8)$(2.4)$(2.8)
International plans1.9 1.5 1.9 — — — 
Net periodic benefit cost$(0.4)$2.7 $4.3 $(1.8)$(2.4)$(2.8)
Schedule of Changes in Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status
The following table presents the changes in the benefit obligation and the fair value of plan assets, as well as the funded status of the plans:
Pension benefitsOther retirement benefits
($ in millions)2021202020212020
Change in benefit obligation:
Benefit obligation, January 1$(298.9)$(287.9)$(6.1)$(6.6)
Service cost(1.6)(1.5)— — 
Interest cost(6.2)(7.1)(0.2)(0.2)
Participants’ contributions(0.6)(0.3)(0.5)(0.1)
Actuarial (loss) gain12.1 (22.1)0.9 0.5 
Amendments/transfers in2.0 — — — 
Benefits paid7.1 6.2 0.3 0.3 
Curtailment gain— 0.1 — — 
Settlement loss13.1 18.6 — — 
Foreign currency translation3.2 (4.9)— — 
Benefit obligation, December 31$(269.8)$(298.9)$(5.6)$(6.1)
Change in plan assets:
Fair value of assets, January 1$258.1 $244.1 $— $— 
Actual return on plan assets6.1 31.8 — — 
Employer contribution3.6 4.8 (0.2)0.2 
Participants’ contributions0.6 0.3 0.5 0.1 
Benefits paid(5.2)(6.0)(0.3)(0.3)
Settlement loss(13.1)(18.6)— — 
Foreign currency translation(0.9)1.7 — — 
Fair value of assets, December 31$249.2 $258.1 $— $— 
Funded status at end of year$(20.6)$(40.8)$(5.6)$(6.1)
Schedule of Amounts Recognized in Balance Sheet
Amounts recognized in the balance sheet were as follows:
Pension benefitsOther retirement benefits
($ in millions)2021202020212020
Noncurrent assets$16.7 $12.9 $— $— 
Current liabilities(1.7)(1.6)(0.7)(0.7)
Noncurrent liabilities(35.6)(52.1)(4.9)(5.4)
$(20.6)$(40.8)$(5.6)$(6.1)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
The amounts in accumulated other comprehensive loss, pre-tax, consisted of:
Pension benefitsOther retirement benefits
($ in millions)2021202020212020
Net actuarial loss (gain)$56.5 $67.3 $(4.7)$(5.4)
Prior service cost (credit)(1.3)0.8 — (0.4)
Total$55.2 $68.1 $(4.7)$(5.8)
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 U.S. qualified defined benefit pension plan is in the process of being terminated. The expected benefit payments listed correspond to regular ongoing benefit payments expected to be made by the plan during future years, and does not reflect additional disbursements that are expected to be made during 2022 as a result of lump sum offering and annuity purchase related to the plan termination process.
 ($ in millions)Domestic International Total
2022$13.7 $2.4 $16.1 
202314.0 2.4 16.4 
202413.4 2.7 16.1 
202512.7 3.1 15.8 
202611.9 3.6 15.5 
2027 to 203155.2 19.6 74.8 
$120.9 $33.8 $154.7 
Schedule of Assumptions Used
Weighted average assumptions used to determine net periodic benefit cost were as follows:
Pension benefitsOther retirement benefits
202120202019202120202019
Discount rate2.29 %2.61 %2.70 %2.30 %3.20 %4.20 %
Rate of compensation increase2.41 %2.33 %2.41 %— — — 
Expected long-term rate of return on assets4.93 %5.10 %5.54 %— — — 

Weighted average assumptions used to determine the benefit obligations were as follows:
Pension benefitsOther retirement benefits
2021202020212020
Discount rate2.48 %2.10 %2.75 %2.30 %
Rate of compensation increase2.79 %2.58 %— — 
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:
202120202019
U.S. plans3.31 %3.30 %3.30 %
International plans0.67 %0.52 %0.85 %
Schedule of Allocation of Plan Assets
The weighted average asset allocations by asset category for our pension plans, at December 31, were as follows:
20212020
Equity securities12 %34 %
Debt securities86 %64 %
Other%%
100 %100 %
The following are the U.S. target asset allocations and acceptable allocation ranges:
Target allocationAllocation range
Equity securities
5%
2% - 8%
Debt securities
95%
92% - 98%
Other
—%
0% - 3%

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)2021Level 1Level 2Level 3
Cash$1.6 $1.6 $— $— 
Equity securities:
International mutual funds21.2 — 21.2 — 
Fixed income securities:
Mutual funds22.1 — 22.1 — 
Other mutual funds4.6 — 4.6 — 
Pension plan assets in the fair value hierarchy$49.5 $1.6 $47.9 $— 
Pension plan assets measured at NAV199.7 
Pension plan assets at fair value$249.2 
Balance at
December 31,Basis of Fair Value Measurements
($ in millions)2020Level 1Level 2Level 3
Cash$1.5 $1.5 $— $— 
Equity securities:
International mutual funds20.6 — 20.6 — 
Fixed income securities:
Mutual funds18.7 — 18.7 — 
Other mutual funds2.9 — 2.9 — 
Pension plan assets in the fair value hierarchy$43.7 $1.5 $42.2 $— 
Pension plan assets measured at NAV214.4 
Pension plan assets at fair value$258.1