Pension and Other Post-Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2021

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, 2021 and 2020 (in millions):

	2021 Pension Benefits		2020 Pension Benefits		2021 Retiree Health and Life		2020 Retiree Health and Life
Service cost	$	2.2	$	2.0	$	0.1	$	0.1
Interest cost	2.0		3.0		—		0.2
Expected return on plan assets	(4.6)		(5.0)		—		—
Amortization of (1):
Unrecognized prior service credit	—		—		(0.1)		(0.1)
Unrecognized net actuarial loss (gain)	3.2		3.3		—		(0.2)
Net periodic cost	$	2.8	$	3.3	$	—	$	—

The following table shows the components of net periodic cost for the six months ended June 30, 2021 and 2020 (in millions):

	2021 Pension Benefits		2020 Pension Benefits		2021 Retiree Health and Life		2020 Retiree Health and Life
Service cost	$	4.4	$	4.0	$	0.1	$	0.1
Interest cost	4.0		6.1		0.1		0.3
Expected return on plan assets	(9.3)		(10.1)		—		—
Amortization of (1):
Unrecognized prior service credit	—		—		(0.1)		(0.1)
Unrecognized net actuarial loss (gain)	6.6		6.4		(0.1)		(0.2)
Net periodic cost	$	5.7	$	6.4	$	—	$	0.1

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(1) Amounts reclassified from accumulated other comprehensive loss.