Pension and Other Post-Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2023

Retirement Benefits [Abstract]

Components of pension and other post retirement benefit costs

The following table shows the components of net periodic cost for the three months ended June 30, 2023 and 2022 (in millions):

	2023 Pension Benefits		2022 Pension Benefits		2023 Retiree Health and Life		2022 Retiree Health and Life
Service cost	$	1.4	$	1.9	$	0.1	$	0.1
Interest cost	4.1		2.3		0.2		0.1
Expected return on plan assets	(5.3)		(3.8)		—		—
Settlement accounting adjustment	1.4		0.9		—		—
Amortization of (1):
Unrecognized prior service credit	—		—		(0.1)		(0.1)
Unrecognized net actuarial loss (gain)	0.3		2.4		(0.2)		(0.1)
Net periodic cost	$	1.9	$	3.7	$	—	$	—

The following table shows the components of net periodic cost for the six months ended June 30, 2023 and 2022 (in millions):

	2023 Pension Benefits		2022 Pension Benefits		2023 Retiree Health and Life		2022 Retiree Health and Life
Service cost	$	2.7	$	3.9	$	0.1	$	0.1
Interest cost	8.3		4.9		0.4		0.2
Expected return on plan assets	(10.7)		(7.8)		—		—
Settlement accounting adjustment	1.4		0.9		—		—
Amortization of (1):
Unrecognized prior service credit	—		—		(0.2)		(0.1)
Unrecognized net actuarial loss (gain)	0.5		4.6		(0.3)		(0.2)
Net periodic cost	$	2.2	$	6.5	$	—	$	—

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(1) Amounts reclassified from accumulated other comprehensive loss.