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Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of net pension and retiree health benefit (income) cost
Net pension and retiree health benefit (income) cost included the following components:
Defined Benefit Pension Plans
Three Months Ended March 31,
 20212020
Components of net periodic benefit cost:
Service cost$92.0 $78.7 
Interest cost84.3 105.0 
Expected return on plan assets(238.0)(221.2)
Amortization of prior service cost1.1 1.1 
Recognized actuarial loss121.8 111.0 
Net periodic benefit cost$61.2 $74.6 
Retiree Health Benefit Plans
Three Months Ended March 31,
 20212020
Components of net periodic benefit income:
Service cost$11.7 $9.8 
Interest cost8.1 11.0 
Expected return on plan assets(36.6)(37.4)
Amortization of prior service benefit(14.9)(14.9)
Recognized actuarial loss0.8 0.8 
Net periodic benefit income$(30.9)$(30.7)