Pension and Other Post-Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2024 and 2023 (in millions):

	2024 Pension Benefits		2023 Pension Benefits		2024 Retiree Health and Life		2023 Retiree Health and Life
Service cost	$	1.4	$	1.3	$	—	$	—
Interest cost	4.0		4.2		0.2		0.2
Expected return on plan assets	(5.4)		(5.4)		—		—
Amortization of (1):
Unrecognized prior service credit	—		—		(0.1)		(0.1)
Unrecognized net actuarial loss (gain)	0.2		0.2		(0.1)		(0.1)
Net periodic cost	$	0.2	$	0.3	$	—	$	—

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(1)    Amounts reclassified from accumulated other comprehensive loss.