Employee Benefits - Projected Benefit Obligation, Fair Value of Assets, Funded Status and the Amounts Not Yet Recognized As Components of Net Periodic Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Retirement Plans
Change in benefit obligation:
Benefit obligation at beginning of period	$ 83.1	$ 88.0
Service Cost	1.8	1.9	$ 1.9
Interest cost	3.6	4.0	4.1
Plan participants' contributions	0.0	0.0
Actuarial loss (gain)	4.3	(2.1)
Benefits paid	(0.5)	(0.5)
Settlements	(13.5)	(8.2)
Benefit obligation at end of period	78.8	83.1	88.0
Change in plan assets:
Fair value of plan assets at beginning of period	84.4	83.3
Actual return on plan assets	9.7	6.6
Company's contribution	3.0	3.2
Plan participants' contributions	0.0	0.0
Benefits paid	(0.5)	(0.5)
Settlements	(13.5)	(8.2)
Fair value of plan assets at end of period	83.1	84.4	83.3
Funded status	4.3	1.3
Items not recognized as components of net periodic cost:
Net actuarial loss	4.5	6.8
PBOP
Change in benefit obligation:
Benefit obligation at beginning of period	21.3	23.4
Service Cost	0.0	0.0	0.0
Service Cost (1)	8.8
Interest cost	1.1	1.1	1.2
Plan participants' contributions	0.9	1.0
Actuarial loss (gain)	0.9	(0.1)
Benefits paid	(4.0)	(4.1)
Settlements	0.0	0.0
Benefit obligation at end of period	29.0	21.3	23.4
Change in plan assets:
Fair value of plan assets at beginning of period	82.5	82.3
Actual return on plan assets	5.2	3.1
Company's contribution	0.2	0.2
Plan participants' contributions	0.9	1.0
Benefits paid	(4.0)	(4.1)
Settlements	0.0	0.0
Fair value of plan assets at end of period	84.8	82.5	$ 82.3
Funded status	55.8	61.2
Items not recognized as components of net periodic cost:
Net actuarial loss	0.9	$ 2.5
PBOP service cost increase due to plan adjustment	$ 8.8