Income Tax Matters - Reconciliation of Income Tax Benefit (Provision) based on Effective Income Tax Rate and Statutory Tax Rate (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation between income tax provision and statutory income tax provision:
Increase in federal valuation allowances	$ (1.1)	$ (0.2)	$ 0.0
State and Local Jurisdiction
Reconciliation between income tax provision and statutory income tax provision:
Increase in federal valuation allowances	0.1	1.6	3.5
State and tax expense (benefit) before adjustments	(1.1)	(0.7)	1.3
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 1.5	$ 1.3	$ 3.7