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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
During 2022, the Company completed the termination of its funded single-employer defined benefit pension plans that covered certain non-bargaining unit employees and bargaining unit employees of the Company and transferred the life insurance benefits for retirees as of June 30, 2022, to an insurance company. The Company continues to maintain its plans that provide retiree health care and the remaining life insurance benefits to certain salaried and hourly employees.
Components of the net periodic benefit cost for the Company's pension and post-retirement plans for the three and nine months ended September 30, 2023 and 2022, are shown below (in millions):
Three Months Ended September 30, Nine Months Ended September 30,
2023202220232022
Service cost$0.1 $0.1 $0.1 $1.5 
Interest cost0.1 — 0.4 0.9 
Expected return on plan assets— — — (2.5)
Amortization of net loss— 0.1 — 1.9 
Amortization of prior service credit— — — 0.1 
Pension termination— — — 76.9 
Net periodic benefit cost$0.2 $0.2 $0.5 $78.8