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Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 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 June 30,Six Months Ended June 30,
 2021202020212020
Components of net periodic benefit cost:
Service cost$93.3 $83.0 $185.3 $161.7 
Interest cost84.8 107.3 169.1 212.3 
Expected return on plan assets(237.2)(220.6)(475.2)(441.8)
Amortization of prior service cost1.1 1.1 2.2 2.2 
Recognized actuarial loss122.6 117.1 244.4 228.1 
Net periodic benefit cost$64.6 $87.9 $125.8 $162.5 
Retiree Health Benefit Plans
Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Components of net periodic benefit income:
Service cost$12.9 $10.6 $24.6 $20.4 
Interest cost8.2 10.9 16.3 21.9 
Expected return on plan assets(36.5)(37.4)(73.1)(74.8)
Amortization of prior service benefit(14.9)(14.9)(29.8)(29.8)
Recognized actuarial loss0.8 0.6 1.6 1.4 
Net periodic benefit income$(29.5)$(30.2)$(60.4)$(60.9)