XML 58 R49.htm IDEA: XBRL DOCUMENT v3.23.1
Retirement Benefits (Components of Net Periodic (Benefit) Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 70.4 $ 89.1
Interest cost 161.1 100.5
Expected return on plan assets (263.3) (239.5)
Amortization of prior service cost 0.6 0.7
Recognized actuarial (gain) loss 30.0 87.0
Net periodic (benefit) cost (1.2) 37.8
Retiree Health Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 7.7 11.2
Interest cost 15.4 9.4
Expected return on plan assets (45.5) (37.9)
Amortization of prior service cost (13.2) (13.7)
Recognized actuarial (gain) loss (0.9) 0.2
Net periodic (benefit) cost $ (36.5) $ (30.8)