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Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2019
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)201920182017201920182017
Net periodic benefit cost:
Service cost$1.4  $10.8  $10.4  $—  $—  $—  
Interest cost9.2  9.4  9.8  0.2  0.2  0.3  
Expected return on assets(12.0) (15.7) (13.5) —  —  —  
Amortization of prior service credit0.1  (1.3) (1.3) (0.7) (0.7) (0.7) 
Amortization of actuarial loss (gain)2.1  3.8  4.9  (2.3) (2.4) (2.6) 
Settlement effects3.5  —  —  —  —  —  
Net periodic benefit cost$4.3  $7.0  $10.3  $(2.8) $(2.9) $(3.0) 
Other changes in plan assets and benefit obligations recognized in OCI, pre-tax:
Net loss (gain) arising during period$1.5  $3.5  $(9.0) $0.1  $(1.4) $(1.1) 
Prior service credit arising during period—  0.3  —  —  —  —  
Amortization of prior service credit(0.1) 1.3  1.3  0.7  0.7  0.7  
Amortization of actuarial (loss) gain(2.1) (3.8) (4.9) 2.3  2.4  2.6  
Settlement effects(3.5) —  —  —  —  —  
Foreign currency translation 0.6  (1.2) 2.6  —  —  —  
Total recognized in OCI$(3.6) $0.1  $(10.0) $3.1  $1.7  $2.2  
Total recognized in net periodic benefit cost and OCI$0.7  $7.1  $0.3  $0.3  $(1.2) $(0.8) 

Net periodic benefit cost by geographic location is as follows:

 Pension benefitsOther retirement benefits
($ in millions)201920182017201920182017
U.S. plans$2.4  $4.8  $7.3  $(2.8) $(2.9) $(3.0) 
International plans1.9  2.2  3.0  —  —  —  
Net periodic benefit cost$4.3  $7.0  $10.3  $(2.8) $(2.9) $(3.0) 
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)2019201820192018
Change in benefit obligation:
Benefit obligation, January 1$(267.0) $(288.0) $(6.0) $(7.1) 
Service cost(1.4) (10.8) —  —  
Interest cost(9.2) (9.4) (0.2) (0.2) 
Participants’ contributions(0.3) (0.6) (0.7) (0.6) 
Actuarial (loss) gain(30.8) 20.4  (0.2) 1.4  
Amendments/transfers in—  (0.3) —  —  
Benefits/expenses paid6.8  18.0  0.5  0.5  
Settlement effects15.0  —  —  —  
Foreign currency translation(1.0) 3.7  —  —  
Benefit obligation, December 31$(287.9) $(267.0) $(6.6) $(6.0) 
Change in plan assets:
Fair value of assets, January 1$214.5  $239.5  $—  $—  
Actual return on assets41.3  (8.3) —  —  
Employer contribution8.0  2.7  (0.2) (0.1) 
Participants’ contributions0.3  0.6  0.7  0.6  
Benefits/expenses paid(6.3) (18.0) (0.5) (0.5) 
Settlement effects(15.0) —  —  —  
Foreign currency translation1.3  (2.0) —  —  
Fair value of assets, December 31$244.1  $214.5  $—  $—  
Funded status at end of year$(43.8) $(52.5) $(6.6) $(6.0) 
Schedule of Amounts Recognized in Balance Sheet
Amounts recognized in the balance sheet were as follows:

Pension benefitsOther retirement benefits
($ in millions)2019201820192018
Noncurrent assets$4.3  $—  $—  $—  
Current liabilities(1.5) (1.6) (0.7) (0.7) 
Noncurrent liabilities(46.6) (50.9) (5.9) (5.3) 
$(43.8) $(52.5) $(6.6) $(6.0) 
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)2019201820192018
Net actuarial loss (gain)$69.4  $73.0  $(7.0) $(9.4) 
Prior service cost (credit)0.8  0.9  (1.0) (1.7) 
Total$70.2  $73.9  $(8.0) $(11.1) 
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:

 ($ in millions)Domestic International Total
2020$21.0  $1.3  $22.3  
202113.5  1.3  14.8  
202215.0  2.0  17.0  
202313.7  1.5  15.2  
202413.5  1.9  15.4  
2025 to 202960.5  13.3  73.8  
$137.2  $21.3  $158.5  
Schedule of Assumptions Used
Weighted average assumptions used to determine net periodic benefit cost were as follows:

Pension benefitsOther retirement benefits
201920182017201920182017
Discount rate2.70 %2.91 %3.48 %4.20 %3.45 %3.90 %
Rate of compensation increase2.41 %4.00 %4.01 %—  —  —  
Long-term rate of return on assets5.54 %6.71 %6.47 %—  —  —  
Weighted average assumptions used to determine the benefit obligations were as follows:

Pension benefitsOther retirement benefits
2019201820192018
Discount rate2.79 %3.76 %3.20 %4.20 %
Rate of compensation increase2.49 %4.01 %—  —  
Schedule of Allocation of Plan Assets
The weighted average asset allocations by asset category for our pension plans, at December 31, were as follows:

20192018
Equity securities33 %23 %
Debt securities65 %74 %
Other%%
100 %100 %
The following are the U.S. target asset allocations and acceptable allocation ranges:

Target allocationAllocation range
Equity securities30%  27% - 33%  
Debt securities70%  67% - 73%
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)2019Level 1Level 2  Level 3
Cash$2.2  $2.2  $—  $—  
Equity securities:
International mutual funds15.5  1.3  14.2  —  
Fixed income securities:
Mutual funds21.7  3.8  17.9  —  
Pension plan assets in the fair value hierarchy$39.4  $7.3  $32.1  $—  
Pension plan assets measured at NAV204.7  
Pension plan assets at fair value$244.1  

Balance at
December 31,Basis of Fair Value Measurements
($ in millions)2018Level 1Level 2Level 3
Cash$1.7  $1.7  $—  $—  
Equity securities:
International mutual funds17.7  17.7  —  —  
Fixed income securities:
Mutual funds13.9  13.9  —  —  
Pension plan assets in the fair value hierarchy$33.3  $33.3  $—  $—  
Pension plan assets measured at NAV181.2  
Pension plan assets at fair value$214.5