Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the three months ended March 31, 2022 and 2021, were as follows (in millions):

	Retirement Plans				PBOP
	For the Three Months Ended March 31,				For the Three Months Ended March 31,
	2022		2021		2022		2021
Service cost	$	0.6	$	0.7	$	—	$	—
Interest cost	0.6		0.5		0.2		0.2
Expected return on plan assets	(1.5)		(1.6)		(0.4)		(0.6)
Amortization of unrecognized net loss	—		0.3		—		—
Settlement charge	0.7		0.4		—		—
Regulatory asset decrease	0.7		—		—		—
Net periodic benefit cost	$	1.1	$	0.3	$	(0.2)	$	(0.4)