Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2022

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 March 31,
	2022		2021
Components of net periodic benefit cost:
Service cost	$	89.1	$	92.0
Interest cost	100.5		84.3
Expected return on plan assets	(239.5)		(238.0)
Amortization of prior service cost	0.7		1.1
Recognized actuarial loss	87.0		121.8
Net periodic benefit cost	$	37.8	$	61.2

	Retiree Health Benefit Plans
	Three Months Ended March 31,
	2022		2021
Components of net periodic benefit income:
Service cost	$	11.2	$	11.7
Interest cost	9.4		8.1
Expected return on plan assets	(37.9)		(36.6)
Amortization of prior service benefit	(13.7)		(14.9)
Recognized actuarial loss	0.2		0.8
Net periodic benefit income	$	(30.8)	$	(30.9)