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Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 93.3 $ 83.0 $ 185.3 $ 161.7
Interest cost 84.8 107.3 169.1 212.3
Expected return on plan assets (237.2) (220.6) (475.2) (441.8)
Amortization of prior service cost 1.1 1.1 2.2 2.2
Recognized actuarial loss 122.6 117.1 244.4 228.1
Net periodic benefit cost 64.6 87.9 125.8 162.5
Retiree Health Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 12.9 10.6 24.6 20.4
Interest cost 8.2 10.9 16.3 21.9
Expected return on plan assets (36.5) (37.4) (73.1) (74.8)
Amortization of prior service cost (14.9) (14.9) (29.8) (29.8)
Recognized actuarial loss 0.8 0.6 1.6 1.4
Net periodic benefit cost $ (29.5) $ (30.2) $ (60.4) $ (60.9)