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Retirement Benefits
 3 Months Ended
Mar. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Retirement Benefits Retirement Benefits
Net pension and retiree health (benefit) cost included the following components:
Defined Benefit Pension Plans
Three Months Ended March 31,
 20242023
Components of net periodic (benefit) cost:
Service cost$83.8 $70.4 
Interest cost165.0 161.1 
Expected return on plan assets(277.6)(263.3)
Amortization of prior service cost0.5 0.6 
Recognized actuarial loss30.6 30.0 
Net periodic (benefit) cost$2.3 $(1.2)
Retiree Health Benefit Plans
Three Months Ended March 31,
 20242023
Components of net periodic benefit:
Service cost$8.2 $7.7 
Interest cost15.5 15.4 
Expected return on plan assets(48.1)(45.5)
Amortization of prior service benefit(1.4)(13.2)
Recognized actuarial gain(0.6)(0.9)
Net periodic benefit$(26.4)$(36.5)