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Retirement Benefits
 3 Months Ended
Mar. 31, 2023
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,
 20232022
Components of net periodic (benefit) cost:
Service cost$70.4 $89.1 
Interest cost161.1 100.5 
Expected return on plan assets(263.3)(239.5)
Amortization of prior service cost0.6 0.7 
Recognized actuarial loss30.0 87.0 
Net periodic (benefit) cost$(1.2)$37.8 
Retiree Health Benefit Plans
Three Months Ended March 31,
 20232022
Components of net periodic benefit:
Service cost$7.7 $11.2 
Interest cost15.4 9.4 
Expected return on plan assets(45.5)(37.9)
Amortization of prior service benefit(13.2)(13.7)
Recognized actuarial (gain) loss(0.9)0.2 
Net periodic benefit$(36.5)$(30.8)