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Retirement Benefits
 3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
The Company has defined contribution retirement plans or defined benefit pension plans covering substantially all employees. Company contributions to defined contribution retirement plans are generally based on a percentage of eligible pay or based on hours worked. Benefits under the defined benefit pension plans are generally based on years of service and/or final average pay. The Company funds the U.S. pension plans in accordance with the Employee Retirement Income Security Act of 1974, as amended, and the Internal Revenue Code of 1986, as amended. The Company also sponsors several postretirement plans covering certain collectively-bargained salaried and hourly employees. The plans provide health care and life insurance benefits for eligible retirees. In most retiree health care plans, Company contributions towards premiums are capped based on the cost as of a certain date, thereby creating a defined contribution. All defined benefit pension and retiree health care plans are closed to new entrants.
For the three month periods ended March 31, 2023 and 2022, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions): 
Pension BenefitsOther Postretirement Benefits
Three months ended March 31,Three months ended March 31,
 2023202220232022
Service cost - benefits earned during the year$1.6 $3.2 $0.2 $0.2 
Interest cost on benefits earned in prior years24.0 17.8 2.7 2.0 
Expected return on plan assets(25.7)(33.1)— — 
Amortization of prior service cost (credit)0.1 0.1 (0.2)(0.3)
Amortization of net actuarial loss14.4 16.0 1.5 3.3 
Total retirement benefit expense $14.4 $4.0 $4.2 $5.2