Pension and Other Post-Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2024

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 September 30, 2024 and 2023 (in millions):

	2024 Pension Benefits		2023 Pension Benefits		2024 Retiree Health and Life		2023 Retiree Health and Life
Service cost	$	1.6	$	1.3	$	—	$	—
Interest cost	4.1		4.1		0.2		0.1
Expected return on plan assets	(5.4)		(5.2)		—		—
Amortization of (1):
Unrecognized prior service credit	—		—		(0.1)		—
Unrecognized net actuarial loss (gain)	0.3		0.2		(0.1)		(0.1)
Net periodic cost	$	0.6	$	0.4	$	—	$	—

The following table shows the components of net periodic cost for the nine months ended September 30, 2024 and 2023 (in millions):

	2024 Pension Benefits		2023 Pension Benefits		2024 Retiree Health and Life		2023 Retiree Health and Life
Service cost	$	4.6	$	4.0	$	0.1	$	0.1
Interest cost	12.3		12.4		0.5		0.5
Expected return on plan assets	(16.2)		(15.9)		—		—
Settlement accounting adjustment	—		1.4		—		—
Amortization of (1):
Unrecognized prior service credit	—		—		(0.2)		(0.2)
Unrecognized net actuarial loss (gain)	0.8		0.7		(0.4)		(0.4)
Net periodic cost	$	1.5	$	2.6	$	—	$	—

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(1)    Amounts reclassified from accumulated other comprehensive loss.