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RETIREMENT BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Schedule of the Funded Status of the Non-U.S. Plans
The following sets forth the funded status of our plans and amounts recorded in Accumulated other comprehensive income (loss) as of the most recent actuarial valuations using measurement dates of December 31 ($ in millions):
U.S. Pension BenefitsNon-U.S. Pension Benefits
2024202320242023
Change in pension benefit obligation:
Benefit obligation at beginning of year$33.2 $33.1 $253.4 $230.7 
Service cost— — 2.8 2.6 
Interest cost1.6 1.7 7.9 8.8 
Employee contributions— — 1.4 1.4 
Benefits paid and other plan costs(2.2)(2.1)(12.2)(11.4)
Actuarial loss (gain)(0.7)0.5 (1.3)12.5 
Amendments, settlements and curtailments— — (5.5)(1.8)
Plan acquisitions and other— — 1.6 (0.4)
Foreign exchange rate impact— — (13.3)11.0 
Benefit obligation at end of year31.9 33.2 234.8 253.4 
Change in plan assets:
Fair value of plan assets at beginning of year27.6 25.9 176.8 162.7 
Actual return on plan assets2.4 2.3 0.9 6.4 
Employer contributions1.2 1.4 8.0 10.9 
Employee contributions— — 1.4 1.4 
Amendments and settlements— — (4.3)(1.2)
Benefits paid and other plan costs(2.2)(2.0)(12.1)(11.4)
Plan acquisitions and other— — 1.5 (0.3)
Foreign exchange rate impact— — (8.0)8.3 
Fair value of plan assets at end of year29.0 27.6 164.2 176.8 
Funded status$(2.9)$(5.6)$(70.6)$(76.6)
The difference between the accumulated benefit obligation and the projected benefit obligation as of December 31, 2024 and 2023 is immaterial.
U.S. Pension BenefitsNon-U.S. Pension Benefits
2024202320242023
Amounts recorded in the Consolidated Balance Sheets as of December 31
Other assets$2.2 $— $9.5 $11.1 
Accrued expenses and other current liabilities(0.6)(0.6)(3.9)(4.0)
Other long-term liabilities(4.5)(5.0)(76.2)(83.7)
Net amount$(2.9)$(5.6)$(70.6)$(76.6)
U.S. Pension BenefitsNon-U.S. Pension Benefits
2024202320242023
Amounts recorded in AOCI as of December 31
Prior service cost$— $— $(0.6)$(1.2)
Net gain (loss)3.7 2.1 (50.4)(48.3)
Total pre-tax amount$3.7 $2.1 $(51.0)$(49.5)
Schedule of Weighted Average Assumptions Used
Weighted average assumptions used to determine benefit obligations at date of measurement
U.S. Pension PlansNon-U.S. Pension Plans
2024202320242023
Discount rate5.62 %5.14 %3.38 %3.33 %
Rate of compensation increase (a)
N/AN/A2.66 %2.65 %
(a) The frozen U.S. pension plans do not use the rate of compensation increase as an input in determining the benefit obligations at date of measurement.
Weighted average assumptions used to determine net periodic pension cost at date of measurement
U.S. Pension PlansNon-U.S. Pension Plans
202420232022202420232022
Discount rate5.14 %5.42 %2.82 %3.33 %3.94 %1.31 %
Expected return on plan assets6.48 %6.47 %5.20 %4.51 %4.36 %2.58 %
Rate of compensation increase (a)
N/AN/AN/A2.77 %2.73 %2.43 %
(a) The frozen U.S. pension plans do not use the rate of compensation increase as an input in determining the net periodic pension cost at date of measurement.
Schedule of Net Periodic Pension Costs
Components of net periodic pension cost
The following sets forth the components of net periodic pension cost for our plans for the years ended December 31 ($ in millions):
U.S. Pension BenefitsNon-U.S. Pension Benefits
202420232022202420232022
Service cost$— $— $— $2.8 $2.6 $3.5 
Interest cost1.6 1.7 1.1 7.9 8.8 3.4 
Expected return on plan assets(1.6)(1.4)(1.4)(7.7)(7.1)(5.2)
Amortization of net loss0.1 0.1 0.1 0.9 0.7 2.6 
Amortization of prior service cost— — — 0.2 0.2 0.2 
Net curtailment and settlement loss recognized— — — (0.8)(0.1)(1.2)
Net periodic pension cost$0.1 $0.4 $(0.2)$3.3 $5.1 $3.3 
Schedule of Fair Value of Pension Plan Assets
The fair values of our pension plan assets as of December 31, 2024, by asset category were as follows ($ in millions): 
Quoted Prices in
Active Market
(Level 1)		Significant Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Cash and equivalents$43.6 $— $— $43.6 
Mutual funds— 41.9 — 41.9 
Insurance contracts— 26.3 — 26.3 
Total$43.6 $68.2 $— $111.8 
Investments measured at NAV(a):
Mutual funds61.3 
Other private investments20.1 
Total assets at fair value$193.2 
(a) The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the total fair value of plan assets.
The fair values of our pension plan assets as of December 31, 2023, by asset category were as follows ($ in millions):
Quoted Prices in
Active Market
(Level 1)		Significant Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Cash and equivalents$8.4 $— $— $8.4 
Mutual funds— 19.4 — 19.4 
Insurance contracts— 25.3 — 25.3 
Total$8.4 $44.7 $— $53.1 
Investments measured at NAV(a):
Mutual funds111.8 
Other private investments39.5 
Total assets at fair value$204.4 
(a) The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the total fair value of plan assets.
Schedule of Expected Benefit Payments
The following sets forth benefit payments to participants, which reflect expected future service, as appropriate, expected to be paid by the plans in the periods indicated ($ in millions):
U.S. Pension PlansNon-U.S. Pension PlansAll Pension Plans
2025$2.5 $13.2 $15.7 
20262.5 13.0 15.5 
20272.6 13.3 15.9 
20282.6 14.2 16.8 
20292.6 13.6 16.2 
2030-203412.5 66.8 79.3