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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Changes in Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan
The changes in the benefit obligation, the changes in fair value of plan assets, and the funded status of the Company’s Pension and Post-Retirement Medical Plans as of and for the years ended December 31, 2024 and 2023 were as follows:
 Pension PlansPost-Retirement
Medical Plan
(in millions)2024202320242023
Change in benefit obligation:
Benefit obligation at beginning of year$429.7 $357.0 $19.6 $13.9 
Service cost53.4 48.1 0.9 0.5 
Interest cost20.3 17.7 0.9 0.7 
Plan amendments— — — 6.0 
Benefit payments(15.5)(18.1)(2.4)(1.4)
Actuarial loss (gain)1.9 25.0 (3.4)(0.1)
Projected benefit obligation at end of year$489.8 $429.7 $15.6 $19.6 
Change in plan assets:
Fair value of plan assets at beginning of year$349.3 $274.2 $— $— 
Actual return on plan assets25.9 34.8 — — 
Benefits paid(15.5)(18.1)(2.4)(1.4)
Employer contributions35.0 58.4 2.4 1.4 
Fair value of plan assets at end of year$394.7 $349.3 $— $— 
Reconciliation of funded status:
Fair value of plan assets at end of year$394.7 $349.3 $— $— 
Less projected benefit obligation at end of year489.8 429.7 15.6 19.6 
Funded status at end of year$(95.1)$(80.4)$(15.6)$(19.6)
Schedule of Expected Benefit Payments
Benefit payments, which reflect expected future services that the Company expects to pay are as follows for the years ended December 31:
(in millions)Pension BenefitsPost-Retirement
Medical Plan
2025$37.3 $1.5 
202631.5 1.6 
202736.2 1.6 
202840.1 1.7 
202944.6 1.6 
Years 2030-2034269.6 7.7 
Schedule of Net Periodic Benefit Cost
The components of net periodic benefit cost for the years ended December 31, 2024, 2023 and 2022 were as follows:
 Pension BenefitsPost-Retirement
Medical Plan
(in millions)202420232022202420232022
Components of net periodic benefit cost:
Service cost$53.4 $48.1 $55.6 $0.9 $0.5 $0.8 
Interest cost20.3 17.7 7.9 0.9 0.7 0.3 
Expected return on plan assets(24.4)(19.2)(17.5)— — — 
Amortization of prior service cost and actuarial loss0.3 — 0.1 0.5 0.1 0.4 
Net periodic benefit cost$49.6 $46.6 $46.1 $2.3 $1.3 $1.5 
Schedule of Pre-tax Amounts Recognized in Other Comprehensive Income (Loss)
The pre-tax amounts recognized in other comprehensive loss (income) for the years ended December 31, 2024, 2023 and 2022 were as follows:
 Pension BenefitsPost-Retirement
Medical Plan
(in millions)202420232022202420232022
Prior service costs $— $— $— $— $6.1 $— 
Net actuarial loss (gain)0.4 9.5 27.6 (3.3)(0.2)(4.0)
Amortization of losses and prior service cost(0.3)(0.1)(0.1)(0.5)(0.1)(0.4)
Total changes in other comprehensive (income) loss$0.1 $9.4 $27.5 $(3.8)$5.8 $(4.4)
Schedule of Pre-tax Amounts in Accumulated Other Comprehensive Loss Not Yet Recognized as Components of Net Periodic Costs
The pre-tax amounts in accumulated other comprehensive (loss) income as of December 31, 2024 and 2023 that have not yet been recognized as components of net periodic costs were as follows:
 Pension BenefitsPost-Retirement
Medical Plan
(in millions)2024202320242023
Prior service costs$(0.3)$(0.4)$(7.6)$(8.7)
Net actuarial (loss) gain(24.6)(24.4)13.5 10.9 
Total$(24.9)$(24.8)$5.9 $2.2 
Schedule of Assumptions Used
The weighted average assumptions used to determine the benefit obligations as of December 31, 2024 and 2023 were as follows:
 Qualified PlanSupplemental Plan Post-Retirement Medical Plan
202420232024202320242023
Discount rate - benefit obligations5.63 %4.99 %5.54 %4.94 %5.39 %4.88 %
Rate of compensation increase4.55 %4.27 %5.00 %4.50 %— — 
The weighted average assumptions used to determine the net periodic benefit costs for the years ended December 31, 2024, 2023 and 2022 were as follows:
 Qualified Plan Supplemental Plan Post-Retirement Medical Plan
 202420232022202420232022202420232022
Discount rates:
Effective rate for service cost 5.00%5.22%2.80%4.94%5.24%2.73%5.00%5.27%2.80%
Effective rate for interest cost 4.90%5.14%2.33%4.90%5.14%2.24%4.82%5.05%1.91%
Effective rate for interest on service cost4.89%5.14%2.45%4.84%5.12%2.29%4.93%5.21%2.65%
Cash balance interest credit rate3.99%4.04%2.06%3.99%4.04%2.06%N/AN/AN/A
Expected long-term rate of return on plan assets6.80%6.75%5.50%N/AN/AN/AN/AN/AN/A
Rate of compensation increase4.55%4.27%4.26%4.50%4.50%4.50%N/AN/AN/A
Schedule of Assumed Health Care Cost Trend Rates
The assumed health care cost trend rates as of December 31, 2024 and 2023 were as follows:
 Post-Retirement
Medical Plan
 20242023
Health care cost trend rate assumed for next year5.9 %6.4 %
Rate to which the cost trend rate was assumed to decline (the ultimate trend rate)4.0 %4.0 %
Year that the rate reaches the ultimate trend rate20492046
Schedule of Fair Value of Assets of the Company's Qualified Plan
The table below presents the fair values of the assets of the Company’s Qualified Plan as of December 31, 2024 and 2023 by level of fair value hierarchy. Assets consist of collective trusts and are measured at fair value based on the closing net asset value (“NAV”) as determined by the fund manager and reported daily. As noted above, the Company’s post-retirement medical plan is funded on a pay-as-you-go basis and has no assets. 
 Fair Value Measurements Using
NAV as Practical Expedient
(in millions)20242023
Equities:
Domestic equities$121.7 $75.0 
Developed international equities46.6 46.9 
Global low volatility equities7.9 21.0 
Emerging market equities19.2 24.8 
Fixed-income178.6 159.9 
Real Estate18.7 19.7 
Cash and cash equivalents2.0 2.0 
Total$394.7 $349.3