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Pension and Postretirement Benefit Plans
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Pension and Postretirement Benefit Plans PENSION AND POSTRETIREMENT BENEFIT PLANS
    Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the three and six months ended June 30, 2024 and 2023 are set forth below (in millions):

Three Months Ended June 30,Six Months Ended June 30,
Pension benefits2024202320242023
Service cost$2.1 $2.4 $4.2 $4.8 
Interest cost6.9 7.3 13.9 14.5 
Expected return on plan assets(7.7)(7.4)(15.4)(14.6)
Amortization of net actuarial losses2.2 2.2 4.4 4.2 
Amortization of prior service cost0.4 0.4 0.7 0.7 
Net periodic pension cost$3.9 $4.9 $7.8 $9.6 

Three Months Ended June 30,Six Months Ended June 30,
Postretirement benefits2024202320242023
Service cost$— $— $0.1 $— 
Interest cost0.4 0.3 0.8 0.6 
Amortization of prior service cost— — 0.1 0.1 
Net periodic postretirement benefit cost$0.4 $0.3 $1.0 $0.7 

    The components of net periodic pension and postretirement benefits cost, other than the service cost component, are included in “Other expense, net” in the Company’s Condensed Consolidated Statements of Operations.
    During the six months ended June 30, 2024, the Company made approximately $18.4 million of contributions to its defined pension benefit plans. The Company currently estimates its minimum contributions for 2024 to its defined pension benefit plans will aggregate to approximately $25.9 million.

    During the six months ended June 30, 2024, the Company made approximately $0.8 million of contributions to its postretirement health care and life insurance benefit plans. The Company currently estimates that it will make approximately $1.7 million of contributions to its postretirement health care and life insurance benefit plans during 2024.