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Retirement Benefits
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [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,
 20252024
Components of net periodic cost:
Service cost$83.7 $83.8 
Interest cost172.8 165.0 
Expected return on plan assets(269.5)(277.6)
Amortization of prior service cost0.5 0.5 
Recognized actuarial loss20.9 30.6 
Net periodic cost$8.4 $2.3 
Retiree Health Benefit Plans
Three Months Ended March 31,
 20252024
Components of net periodic benefit:
Service cost$8.3 $8.2 
Interest cost15.8 15.5 
Expected return on plan assets(46.2)(48.1)
Amortization of prior service benefit(0.1)(1.4)
Recognized actuarial gain(0.8)(0.6)
Net periodic benefit$(23.0)$(26.4)