Income Tax Matters - Reconciliation of Income Tax (Provision) Benefit based on Effective Income Tax Rate and Statutory Tax Rate (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation between income tax provision and statutory income tax provision:
Increase (decrease) in federal valuation allowances	$ 0.0	$ 0.0	$ 1.1
Total state income tax (provision) benefit	1.4	(1.5)	0.5
Current state income tax provision	3.3	(0.6)	2.5
State and Local Jurisdiction
Reconciliation between income tax provision and statutory income tax provision:
Increase (decrease) in federal valuation allowances	(2.8)	1.0	(0.1)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	2.9	1.9	(1.5)
Total state income tax (provision) benefit	(1.4)	1.5	(0.5)
Current state income tax provision	$ 1.5	$ 1.4	$ (1.1)