Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2025

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Components of net periodic benefit cost for both the Retirement Plans and PBOP were as follows (in millions):

	Retirement Plans				PBOP
	For the Three Months Ended March 31,				For the Three Months Ended March 31,
	2025		2024		2025		2024
Service cost	$	0.5	$	0.5	$	—	$	—
Interest cost	1.0		1.0		0.3		0.3
Expected return on plan assets	(1.1)		(1.0)		(0.7)		(0.6)
Amortization of unrecognized net loss	—		0.2		—		—
Settlement charge	0.3		0.1		—		—
Net periodic benefit cost (credit)	$	0.7	$	0.8	$	(0.4)	$	(0.3)