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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure
Defined Benefit Pension and Other Postretirement Benefit (OPEB) Plans

We sponsor several defined benefit pension and OPEB plans for our employees, including non-qualified pension plans. The U.S. qualified and non-qualified defined benefit pension plans comprise the majority of our total benefit obligation and benefit cost. We maintain a separate defined benefit plan for eligible employees in our U.K. operation. The U.S. defined benefit pension plans were closed to new entrants on December 31, 2013, the OPEB plan was closed to new entrants on December 31, 2012, and the U.K. plan was closed to new entrants on December 31, 2002.

The following table provides the components of the net periodic benefit cost (credit) for the defined benefit pension and OPEB plans.
Three Months Ended June 30
 Pension Benefits
 U.S. PlansU.K. PlanOPEB
 202420232024202320242023
(in millions of dollars)
Service Cost$2.3 $2.3 $— $— $— $— 
Interest Cost20.7 22.0 1.9 1.9 1.0 1.2 
Expected Return on Plan Assets(22.8)(23.1)(2.1)(2.1)(0.1)(0.1)
Amortization of:
   Net Actuarial (Gain) Loss 3.6 3.8 0.7 0.7 (0.4)(2.7)
Total Net Periodic Benefit Cost (Credit)$3.8 $5.0 $0.5 $0.5 $0.5 $(1.6)

Six Months Ended June 30
 Pension Benefits  
 U.S. PlansU.K. PlanOPEB
 202420232024202320242023
(in millions of dollars)
Service Cost$4.6 $4.6 $— $— $— $— 
Interest Cost41.4 44.0 3.8 3.8 2.0 2.3 
Expected Return on Plan Assets(45.6)(46.1)(4.2)(4.2)(0.2)(0.2)
Amortization of:
   Net Actuarial (Gain) Loss 7.3 7.6 1.5 1.3 (0.6)(5.3)
   Prior Service Credit— — — — (0.1)(0.1)
Total Net Periodic Benefit Cost (Credit)$7.7 $10.1 $1.1 $0.9 $1.1 $(3.3)

The service cost component of net periodic pension and postretirement benefit cost (credit) is included as a component of compensation expense in our consolidated statements of income. All other components of net periodic pension and postretirement benefit cost (credit) are included in other expenses.