Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current expense: State	$ 0.5	$ 0.1	$ 0.4
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred provision: State	0.2	0.2	0.1
Income taxes	$ 0.7	0.3	0.5
Open Tax Year	2018 2019 2020 2021
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 0.0	0.0	$ 0.0
Deferred Tax Assets, Net (Significant)	$ 0.0	$ 0.0