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Pension and Other Benefits
 3 Months Ended
Mar. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pension and Other Benefits Pension and Other Benefits
 
The following table sets forth the components of net pension and other benefit costs for the three months ended March 31, 2024 and 2023 (in millions):
 Pension BenefitsOther Benefits
 2024202320242023
Three Months Ended March 31,    
Service cost$0.1 $0.1 $— $— 
Interest cost8.3 8.7 0.2 0.2 
Expected return on plan assets(7.7)(7.0)— — 
Amortization of prior service cost0.1 0.1 — — 
Amortization of actuarial losses (gains)3.1 2.6 (0.1)(0.1)
NET PERIODIC BENEFIT COST$3.9 $4.5 $0.1 $0.1 


Employer Contributions
 
The Company made no contributions to its qualified domestic defined benefit pension plan and no contributions to its foreign pension plans during the three months ended March 31, 2024. Although not required by ERISA and the Internal Revenue Code, the Company may elect to make additional voluntary contributions to its qualified domestic defined benefit pension plan in 2024.