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Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 87.1	$ 92.5	$ 264.4	$ 277.8
Interest cost	98.9	84.5	299.0	253.6
Expected return on plan assets	(235.1)	(237.5)	(711.6)	(712.7)
Amortization of prior service cost	0.6	1.0	1.9	3.2
Recognized actuarial loss	85.3	121.9	256.8	366.3
Net periodic benefit cost	36.8	62.4	110.5	188.2
Retiree Health Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	11.7	12.4	35.0	37.0
Interest cost	9.4	8.1	28.4	24.4
Expected return on plan assets	(38.0)	(36.5)	(114.1)	(109.6)
Amortization of prior service cost	(13.7)	(14.9)	(41.1)	(44.7)
Recognized actuarial loss	0.2	0.8	0.7	2.4
Net periodic benefit cost	$ (30.4)	$ (30.1)	$ (91.1)	$ (90.5)

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- Definition

Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation.

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