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Pension And Other Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Net Funded Status
The following sets forth the funded status of the Company’s plans as of the most recent actuarial valuations using measurement dates of December 31 ($ in millions):
Pension Benefits
20202019
Change in pension benefit obligation:
Benefit obligation at beginning of year$(195.8)$(140.0)
Service cost(10.3)(9.1)
Interest cost(1.8)(2.4)
Employee contributions(4.0)(4.2)
Benefits and other expenses paid5.1 6.2 
Actuarial loss(7.9)(37.7)
Amendments, settlements and curtailments28.5 (5.6)
Foreign exchange rate impact(13.6)(3.0)
Benefit obligation at end of year(199.8)(195.8)
Change in plan assets:
Fair value of plan assets at beginning of year107.3 90.2 
Actual return on plan assets5.9 7.7 
Employer contributions8.3 8.2 
Employee contributions4.0 4.2 
Amendments and settlements(22.3)0.8 
Benefits and other expenses paid(5.1)(6.2)
Foreign exchange rate impact7.6 2.4 
Fair value of plan assets at end of year105.7 107.3 
Funded status$(94.1)$(88.5)
Defined Benefit Plan, Assumptions
Weighted average assumptions used to determine benefit obligations at date of measurement:
December 31,
20202019
Discount rate0.7 %1.0 %
Rate of compensation increase1.3 %1.3 %
Weighted average assumptions used to determine net periodic pension cost at date of measurement: 
December 31,
20202019
Discount rate1.0 %1.8 %
Expected long-term return on plan assets3.5 %3.5 %
Rate of compensation increase1.3 %1.3 %
Schedule of Net Benefit Costs
Components of net periodic pension cost:
December 31,
($ in millions)202020192018
Service cost$(10.3)$(9.1)$(10.0)
Interest cost(1.8)(2.4)(2.0)
Expected return on plan assets3.8 3.2 3.8 
Amortization of prior service credit and initial net obligation0.2 (0.2)(0.1)
Amortization of actuarial loss(1.7)(0.4)(0.8)
Net settlement and curtailment (losses) gains(1.4)1.3 1.8 
Net periodic pension cost$(11.2)$(7.6)$(7.3)
Schedule of Defined Benefit Plans Disclosures The net periodic benefit cost of the defined benefit pension plans incurred during the years ended December 31, 2020, 2019 and 2018 are reflected in the following captions in the accompanying Consolidated and Combined Statements of Income ($ in millions):
Year Ended December 31,
202020192018
Service cost:
Selling, general and administrative expenses$(10.3)$(9.1)$(10.0)
Other net periodic pension costs:
Other (expense) income(0.9)1.5 2.7 
Total$(11.2)$(7.6)$(7.3)
Schedule of Allocation of Plan Assets
The fair values of the Company’s pension plan assets as of December 31, 2020, by asset category, were as follows ($ in millions):
Quoted Prices in
Active Market
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Cash and equivalents$0.3 $— $— $0.3 
Insurance contracts— — 78.8 78.8 
Total$0.3 $— $78.8 $79.1 
Investments measured at NAV (a):
Mutual funds26.6 
Total assets at fair value$105.7 
______________
(a)The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the total plan assets.
The fair values of the Company’s pension plan assets as of December 31, 2019, by asset category, were as follows ($ in millions):
Quoted Prices in
Active Market
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Cash and equivalents$0.3 $— $— $0.3 
Insurance contracts— — 82.7 82.7 
Total$0.3 $— $82.7 $83.0 
Investments measured at NAV (a):
Mutual funds24.3 
Total assets at fair value$107.3 
______________
(a)The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the total plan assets.
Summary of Changes in Level 3 Pension Plan Assets
The following table summarizes the changes in Level 3 pension plan assets measured at fair value on a recurring basis for the year ended December 31, 2020 (in millions):
Fair Value at January 1Return on Plan AssetsNet Purchases/(Settlements)Transfers Into/(Out of) Level 3Fair Value at December 31
Insurance contracts$82.7 $10.1 $(14.0)$— $78.8 
The following table summarizes the changes in Level 3 pension plan assets measured at fair value on a recurring basis for the year ended December 31, 2019 (in millions):
Fair Value at January 1Return on Plan AssetsNet Purchases/(Settlements)Transfers Into/(Out of) Level 3Fair Value at December 31
Insurance contracts$69.2 $5.4 $8.1 $— $82.7 
Schedule of Expected Benefit Payments
The following sets forth benefit payments, which reflect expected future service, as appropriate, at December 31, 2020, are expected to be paid by the plans in the periods indicated ($ in millions):
2021$8.5 
2022$7.8 
2023$7.2 
2024$6.9 
2025$6.9 
2026 - 2030$32.3