Retirement Benefits

6 Months Ended

Jun. 30, 2022

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Retirement Benefits

Retirement Benefits

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,
	2022		2021		2022		2021
Components of net periodic benefit cost:
Service cost	$	88.2	$	93.3	$	177.3	$	185.3
Interest cost	99.6		84.8		200.1		169.1
Expected return on plan assets	(237.0)		(237.2)		(476.5)		(475.2)
Amortization of prior service cost	0.6		1.1		1.3		2.2
Recognized actuarial loss	84.5		122.6		171.5		244.4
Net periodic benefit cost	$	35.9	$	64.6	$	73.7	$	125.8

	Retiree Health Benefit Plans
	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Components of net periodic benefit income:
Service cost	$	12.1	$	12.9	$	23.3	$	24.6
Interest cost	9.6		8.2		19.0		16.3
Expected return on plan assets	(38.2)		(36.5)		(76.1)		(73.1)
Amortization of prior service benefit	(13.7)		(14.9)		(27.4)		(29.8)
Recognized actuarial loss	0.3		0.8		0.5		1.6
Net periodic benefit income	$	(29.9)	$	(29.5)	$	(60.7)	$	(60.4)